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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Benefit (charge) within operating expense $ (18,000) $ (1,000) $ 9,000
Accounts receivable allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 17,182 13,847 14,915
Charged to Earnings 23,003 10,890 12,335
Transferred from Other Accounts 0 0 0
Deductions 17,424 7,555 13,403
Balance at End of Period 22,761 17,182 13,847
Self-insurance accruals      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 357,526 348,612 336,901
Charged to Earnings 436,148 359,528 327,306
Transferred from Other Accounts 86,832 82,904 74,153
Deductions 469,521 433,518 389,748
Balance at End of Period 410,985 357,526 348,612
Valuation allowance on deferred tax assets      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 16,186 18,667 16,387
Charged to Earnings 1,906 (534) 2,213
Transferred from Other Accounts 0 0 0
Deductions 515 1,947 (67)
Balance at End of Period $ 17,577 $ 16,186 $ 18,667