Accrued Expenses and other current liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accrued Liabilities, Current [Abstract]
Accrued interest	$ 25,030	$ 26,373
Accrued bonus	10,444	12,049
Accrued insurance	53,745	50,470
Accrued property and other taxes	16,656	15,980
Construction retainage	1,463	3,412
Other	28,145	32,328
Total	$ 135,483	$ 140,612