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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Leases $ 15,483 $ 123,129
Asset retirement obligations 2,581 10,403
Net operating loss carry-forwards 5,878 7,723
Pension liabilities 2,148 3,868
Accruals and stock based compensation 2,572 3,093
Other 6,300 5,002
Total gross deferred tax assets 34,962 153,218
Less valuation allowance 0 0
Net deferred tax assets 34,962 153,218
Deferred tax liabilities:    
Property, plant and equipment 92,449 127,602
Leases 15,410 126,458
Intangible assets 10,710 25,722
Prepaid assets and other 2,407 22,120
Total gross deferred tax liabilities 120,976 301,902
Net deferred tax liabilities $ 86,014 $ 148,684