Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT (Narrative) (Details)

v3.20.1
LONG-TERM DEBT (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Nov. 25, 2019
Debt Instrument [Line Items]        
Debt issuance costs, net $ 22,395,000   $ 23,751,000  
Capitalized interest expense, undeveloped properties 200,000 $ 800,000    
Aggregate principal amount 200,000,000      
Gain on debt extinguishment 15,322,000 $ 0    
Revolving Credit Facility        
Debt Instrument [Line Items]        
Aggregate principal amount 25,900,000      
Repurchase amount 10,200,000      
Gain on debt extinguishment 15,300,000      
Construction loan        
Debt Instrument [Line Items]        
Debt issuance costs, net 100,000      
6.000% senior unsecured notes due 2024 | Senior notes        
Debt Instrument [Line Items]        
Long-term debt $ 595,903,000   603,428,000  
Stated interest rate, percent 6.00%      
Debt issuance costs, net $ 6,500,000      
Aggregate principal amount 7,500,000      
6.625% senior unsecured notes due 2023 | Senior notes        
Debt Instrument [Line Items]        
Long-term debt $ 329,467,000   329,467,000  
Stated interest rate, percent 6.625%      
Debt issuance costs, net $ 3,100,000      
6.375% senior unsecured notes due 2025 | Senior notes        
Debt Instrument [Line Items]        
Long-term debt $ 521,360,000   529,525,000  
Stated interest rate, percent 6.375%      
Debt issuance costs, net $ 9,100,000      
Aggregate principal amount 8,200,000      
6.375% senior unsecured notes due 2026 | Senior notes        
Debt Instrument [Line Items]        
Long-term debt $ 387,367,000   397,529,000  
Stated interest rate, percent 6.375%      
Debt issuance costs, net $ 3,600,000      
Aggregate principal amount $ 10,200,000      
Nova Scotia, Amegy, KeyBank | Revolving credit agreement        
Debt Instrument [Line Items]        
Credit facility interest rate at the eurodollar rate 2.45%      
Nova Scotia, Amegy, KeyBank | Revolving credit agreement | Revolving credit agreement        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 1,500,000,000      
Elected commitment amount 1,000,000,000.0     $ 1,200,000,000
Long-term debt 65,000,000   $ 120,000,000  
Remaining borrowing capacity 698,200,000      
Nova Scotia, Amegy, KeyBank | Letter of credit | Revolving credit agreement        
Debt Instrument [Line Items]        
Credit facility outstanding 236,800,000      
Carry value | Senior notes        
Debt Instrument [Line Items]        
Carrying value of notes 1,800,000,000      
Fair value | Level 1 | Senior notes        
Debt Instrument [Line Items]        
Carrying value of notes $ 447,400,000