Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounts Payable and Accrued Liabilities, Current [Abstract]
Salaries and wages	$ 86,476	$ 88,425
Insurance reserves	63,230	61,150
Vacation	37,415	37,109
Real estate taxes	25,979	25,302
Interest	16,196	15,458
Accrued utilities	7,601	8,883
Taxes payable	1,360	2,782
Other	28,446	59,118
Total	$ 266,703	$ 298,227