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Selected Balance Sheet Information: Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Selected Balance Sheet Information [Abstract]    
Accrued employee compensation, benefits and withholdings $ 64,417 $ 74,387
Accrued property taxes 42,944 50,874
Customer deposits and prepayments 43,151 48,814
Accrued interest 33,764 33,680
Other (none of which is individually significant) 42,044 37,004
Total accrued liabilities $ 226,320 $ 244,759