Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Accrued Liabilities, Current [Abstract]
Interest	$ 17,613	$ 28,246
Employee related costs	87,784	119,931
Income taxes payable	14,138	2,112
Other accrued expenses	115,887	103,797
Total accrued liabilities	$ 235,422	$ 254,086