Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accrued Liabilities, Current [Abstract]
Interest	$ 11,473	$ 28,246
Employee related costs	73,093	119,931
Income taxes payable	37,899	2,112
Other accrued expenses	45,836	50,504
Total accrued liabilities	$ 168,301	$ 200,793