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Income Taxes - Analysis of Deferred Taxes (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Tax effect of temporary differences:    
Net operating loss carryforwards $ 31,624 $ 99,615
Oil and gas properties – full cost 76,766 (476,367)
Asset retirement obligations 79,618 113,907
Stock compensation 5,199 5,603
Hedges (13,598) (54,439)
Accrued incentive compensation 1,234 6,185
Other (722) (966)
Total deferred tax assets (liabilities) 180,121 (306,462)
Valuation allowance (180,121) 0
Net deferred tax liabilities $ 0 $ (306,462)