Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accrued Expenses [Abstract]
Salaries and wages	$ 102,025	$ 80,291
Insurance reserves	71,123	94,948
Real estate taxes	34,002	37,206
Vacation	42,411	44,421
Lease payable	11,211	20,714
Interest	12,948	12,940
Accrued Utilities	10,582	11,949
Income taxes	2,818	3,265
Other	40,917	67,140
Total	$ 328,037	$ 372,874