Supplemental Balance Sheet, Income Statement and Cash Flow Information - Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accrued liabilities
Accrued compensation	$ 51,993	$ 82,462
Deferred revenue and proceeds on insurance and asset sales	59,816	61,473
Other taxes payable	34,333	28,602
Workers' compensation liabilities	6,588	7,788
Interest payable	71,814	62,935
Litigation reserves	14,939	13,976
Dividends declared and payable		3,653
Other accrued liabilities	7,688	15,196
Accrued liabilities	$ 247,171	$ 276,085