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Selected Balance Sheet Information: Accrued Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Selected Balance Sheet Information [Abstract]    
Accrued employee compensation, benefits and withholdings $ 45,070 $ 62,837
Accrued property taxes 45,666 44,547
Customer deposits and prepayments 43,524 54,728
Accrued interest 43,776 31,868
Other (none of which is individually significant) 25,409 32,787
Total accrued liabilities $ 203,445 $ 226,767