Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accrued Expenses [Abstract]
Salaries and wages	$ 80,291	$ 124,935
Insurance reserves	94,948	116,858
Real estate taxes	37,206	43,155
Vacation	44,421	43,037
Lease payable	20,714	30,001
Interest	12,940	12,757
Accrued Utilities	11,949	12,798
Income taxes	3,265	2,679
Other	67,140	36,434
Total	$ 372,874	$ 422,654