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Business Description And Significant Accounting Policies: Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accrued employee compensation, benefits and withholdings $ 77,806 $ 62,837
Accrued property taxes 47,105 44,547
Customer deposits and prepayments 52,185 54,728
Accrued interest 31,520 31,868
Other (none of which is individually significant) 34,996 32,787
Total accrued liabilities $ 243,612 $ 226,767