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Selected Balance Sheet Information: Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Selected Balance Sheet Information [Abstract]    
Accrued employee compensation, benefits and withholdings $ 65,309 $ 62,837
Accrued property taxes 40,624 44,547
Customer deposits and prepayments 59,510 54,728
Accrued interest 46,044 31,868
Other (none of which is individually significant) 32,523 32,787
Total accrued liabilities $ 244,010 $ 226,767