Annual report pursuant to Section 13 and 15(d)

Income Taxes (Narrative) (Details)

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Income Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Loss Carryforwards [Line Items]      
Alternative minimum tax credits $ 23,629,000 $ 24,053,000 $ 7,968,000
Foreign tax credit carryforwards 2,074,000 2,074,000 2,074,000
Valuation allowance of deferred tax assets 281,782,000 3,145,000 4,743,000
Change in deferred tax asset valuation 278,637,000 0 0
Impairment of oil and gas properties 1,440,418,000 0 0
Federal and state income taxes payable 0 17,700,000  
Diamondback      
Operating Loss Carryforwards [Line Items]      
Taxable gain on contribution   203,300,000  
Deferred tax expense     35,700,000
Gain from sale of equity investment     120,000,000
Current tax expense     $ 13,200,000
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 132,000,000    
Louisiana      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforward $ 88,600,000