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Income Taxes - Summary of Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Federal net operating loss $ 133,804 $ 131,204
Foreign tax loss carryforward 45,980 2,316
State net operating loss 25,740 24,270
Asset retirement obligations 106,604 89,059
Tax credits 522 449
Derivatives 16,346 2,794
Other well equipment inventory 9,470 10,014
Accrued bonus 3,069 3,753
Operating lease liabilities 4,904 2,317
Other 7,727 7,004
Total deferred tax assets 354,166 273,180
Valuation allowance (178,998) (19,118)
Total deferred tax assets, net 175,168 254,062
Deferred tax liabilities:    
Oil and gas properties 170,596 211,216
Deferred financing 1,765 3,752
Operating lease assets 1,652 1,814
Prepaid 3,216 3,419
Total deferred tax liabilities 177,229 220,201
Net deferred tax (liability) $ (2,061)  
Net deferred tax asset   $ 33,861