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Other Assets and Accrued Liabilities - Asset Removal Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Balance at beginning of year $ 5,113 $ 6,152 $ 8,808
Additional liabilities accrued 4,334 262 593
Changes to prior estimates (44) (1,633) (3,659)
Payments 0 0 0
Accretion expense 421 332 410
Balance at end of year $ 9,824 $ 5,113 $ 6,152