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Accrued Liabilities Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accrued Liabilities [Abstract]    
Accrued insurance costs $ 94,744 $ 104,557
Accrued compensation 48,027 38,547
Deferred revenue 61,066 52,589
Taxes other than income 48,038 28,397
Accrued legal settlement 5,440 440
Deferred compensation 9,437 9,711
Accrued interest payable 1,041 1,391
Accrued dividends 17,003 15,912
Accrued other 35,787 24,233
Accrued liabilities $ 320,583 $ 275,777