Quarterly report pursuant to Section 13 or 15(d)

EQUITY INVESMENTS (Narrative) (Details)

v3.10.0.1
EQUITY INVESMENTS (Narrative) (Details)
$ / shares in Units, a in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 26, 2018
USD ($)
shares
Jun. 29, 2018
USD ($)
shares
May 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2014
entity
Sep. 30, 2018
USD ($)
a
project
$ / shares
Sep. 30, 2017
USD ($)
Dec. 31, 2014
a
Jun. 05, 2017
$ / shares
shares
Feb. 17, 2017
$ / shares
Dec. 15, 2016
$ / shares
Apr. 30, 2015
bbl
Jun. 30, 2014
bbl
Schedule of Equity Method Investments [Line Items]                                
(Income) loss from equity method investments, net         $ (12,858,000) $ 2,737,000     $ (35,282,000) $ 33,468,000            
Distributions from equity method investments                 446,000 4,114,000            
Share price (in usd per share) | $ / shares                         $ 19.48 $ 20.96    
Gain on sale of equity method investments         2,733,000 0     124,768,000 12,523,000            
Proceeds from sale of equity method investments                 226,487,000 0            
Payments for equity method investments                 2,318,000 44,844,000            
Mammoth Energy Services LP                                
Schedule of Equity Method Investments [Line Items]                                
Distributions from equity method investments                 1,200,000              
Equity method investment, ownership interest, percent 22.00%                              
Shares owned (in shares) | shares 9,829,548                              
Gain (loss) on disposition of stock from equity method investee         2,700,000       $ 28,300,000              
Share dividend (in usd per share) | $ / shares                 $ 0.125              
Tatex Thailand II, LLC                                
Schedule of Equity Method Investments [Line Items]                                
(Income) loss from equity method investments, net         $ (137,000) (95,000)     $ (241,000) (549,000)            
Equity method investment, ownership interest, percent         23.50%       23.50%              
Tatex Thailand III LLC                                
Schedule of Equity Method Investments [Line Items]                                
Distributions from equity method investments       $ 200,000                        
Grizzly Oil Sands ULC                                
Schedule of Equity Method Investments [Line Items]                                
Gas and oil area, reserve (in acres) | a                 830              
(Income) loss from equity method investments, net         $ 275,000 296,000     $ 833,000 869,000            
Number of oil sand projects | project                 3              
Production volume (in bbls/day) | bbl                             2,200 11,300
Other than temporary impairment loss                 $ 0 0            
Equity method investment, amount of cash calls, based on proportionate ownership interest                 2,300,000              
Equity method investments, increase (decrease) due to foreign currency translation adjustment         $ 2,900,000 6,700,000     $ (5,700,000) 12,500,000            
Equity method investment, ownership interest, percent         24.9999%       24.9999%              
Timber Wolf Terminals LLC                                
Schedule of Equity Method Investments [Line Items]                                
(Income) loss from equity method investments, net         $ 0 4,000     $ 536,000 8,000            
Distributions from equity method investments                 $ 400,000              
Equity method investment, ownership interest, percent         50.00%       50.00%              
Windsor Midstream LLC                                
Schedule of Equity Method Investments [Line Items]                                
(Income) loss from equity method investments, net         $ 0 (2,000)     $ (9,000) 25,232,000            
Distributions from equity method investments                 $ 0 500,000            
Equity method investment, ownership interest, percent         22.50%       22.50%              
Sturgeon Acquisitions LLC                                
Schedule of Equity Method Investments [Line Items]                                
(Income) loss from equity method investments, net         $ 0 0     $ 0 (71,000)            
Equity method investment, ownership interest, percent         0.00%     25.00% 0.00%   25.00%          
Gain on sale of equity method investments             $ 12,500,000                  
Mammoth Energy Services LP                                
Schedule of Equity Method Investments [Line Items]                                
Equity method investments, increase (decrease) due to foreign currency translation adjustment         $ 100,000 160,000     $ (200,000) 230,000            
Equity method investment, ownership interest, percent               30.50%     30.50%          
Number of entities contributed for ownership interest (in entities) | entity               4                
Shares received from equity method investee in exchange for ownership interest (in shares) | shares                       2,000,000        
Share price (in usd per share) | $ / shares                       $ 18.50        
Strike Force Midstream LLC                                
Schedule of Equity Method Investments [Line Items]                                
(Income) loss from equity method investments, net         $ 0 $ 127,000     (693,000) 2,585,000            
Distributions from equity method investments     $ 175,000,000           $ 800,000 3,600,000            
Equity method investment, ownership interest, percent     25.00%   0.00%       0.00%              
Gain on sale of equity method investments     $ 96,400,000                          
Payments for equity method investments                   $ 43,000,000            
Over-allotment option | Mammoth Energy Services LP                                
Schedule of Equity Method Investments [Line Items]                                
Proceeds from sale of equity method investments $ 4,500,000 $ 47,000,000                            
Over-allotment option | Common Stock | Mammoth Energy Services LP                                
Schedule of Equity Method Investments [Line Items]                                
Number of shares sold (in shares) | shares 118,974 1,235,600                            
Phu Horm Field | Apico Llc                                
Schedule of Equity Method Investments [Line Items]                                
Gas and oil area, reserve (in acres) | a                 180              
Concession Acreage in Southeast Asia | Tatex Thailand III LLC                                
Schedule of Equity Method Investments [Line Items]                                
Gas and oil area, reserve (in acres) | a                     245          
Apico Llc | Tatex Thailand II, LLC                                
Schedule of Equity Method Investments [Line Items]                                
Ownership percentage         8.50%       8.50%              
Strike Force Midstream LLC | Rice Energy Inc                                
Schedule of Equity Method Investments [Line Items]                                
Ownership percentage by parent       75.00%