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Income Taxes Income Taxes (Tables)
12 Months Ended
Dec. 31, 2021
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
The table below presents the components of our provision for income tax (expense) benefit for the periods presented:

Year Ended December 31,
202120202019
(in thousands)
Current:
Federal$— $1,592 $1,366 
State(200)(220)(300)
Total current income tax benefit(200)1,372 1,066 
Deferred:
Federal(23,790)5,460 4,507 
State(2,593)1,070 (2,251)
Total deferred income tax (expense) benefit(26,383)6,530 2,256 
Income tax (expense) benefit $(26,583)$7,902 $3,322 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
The following table presents a reconciliation of the federal statutory rate to the effective tax rate related to our (expense) benefit for income taxes for the periods presented:

Year Ended December 31,
202120202019
Federal statutory tax rate21.0 %21.0 %21.0 %
State income tax, net3.2 3.0 3.6 
Federal tax credits— — (3.3)
Effect of state income tax rate changes— 0.2 (6.4)
Change in valuation allowance(19.8)(22.1)(0.6)
Non-deductible compensation0.3 (0.6)(5.0)
Non-deductible acquisition costs— (0.1)(2.3)
Non-deductible government relations0.1 (0.1)(1.0)
Other non-deductible items— — (0.5)
Other— (0.2)— 
Effective tax rate4.8 %1.1 %5.5 %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Tax effects of temporary differences that give rise to significant portions of deferred tax assets and deferred tax liabilities as of the dates indicated:

December 31,
20212020
(in thousands)
Deferred tax assets:
Deferred compensation$9,949 $10,472 
Asset retirement obligations38,274 39,371 
Federal NOL carryforward97,555 97,880 
State NOL and tax credit carryforwards, net20,266 21,034 
Federal tax - credit carryforwards3,059 3,059 
Net change in fair value of unsettled commodity derivatives88,053 18,351 
Prepaid revenue3,854 4,364 
Other4,454 5,741 
Valuation allowance(56,634)(165,575)
Total gross deferred tax assets208,830 34,697 
Deferred tax liabilities:
Properties and equipment235,213 33,183 
Convertible debt— 1,514 
Total gross deferred tax liabilities235,213 34,697 
Net deferred tax liability$26,383 $—