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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Net operating loss carryforwards $ 14,310 $ 1,556
Accruals 2,993 2,144
Asset retirement obligations 26,383 27,064
Derivative instruments 0 18,982
Tax credits 0 528
Interest limitation carryforward 7,486 0
Other 2,033 867
Subtotal 53,205 51,141
Valuation allowance 0 (7,748)
Total deferred tax assets 53,205 43,393
Deferred tax liabilities:    
Book tax differences in property basis (95,348) (45,281)
Derivative instruments (3,692) 0
Total deferred tax liabilities (99,040) (45,281)
Net deferred tax asset (liability) $ (45,835) $ (1,888)