Annual report pursuant to Section 13 and 15(d)

Income Taxes - Narrative (Details)

v3.6.0.2
Income Taxes - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Loss Carryforwards [Line Items]      
Alternative minimum tax credits $ 3,842,000 $ 23,629,000 $ 24,053,000
Foreign tax credit carryforwards 2,074,000 2,074,000 2,074,000
Valuation allowance of deferred tax assets 645,841,000 303,246,000 13,522,000
Change in deferred tax asset valuation 343,944,000 278,637,000 0
Impairment of oil and gas properties 715,495,000 1,440,418,000 0
Federal and state income taxes payable   $ 0 0
Diamondback      
Operating Loss Carryforwards [Line Items]      
Gain from sale of equity investment     203,300,000
Change in deferred tax asset valuation     79,400,000
Investment in Blackhawk Midstream LLC      
Operating Loss Carryforwards [Line Items]      
Gain from sale of equity investment     83,700,000
Change in deferred tax asset valuation     $ 32,300,000
Federal      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforward 463,100,000    
State      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforward $ 111,900,000