Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accrued Liabilities, Current [Abstract]
Interest	$ 21,687	$ 28,685
Employee related costs	95,066	102,608
Income taxes payable	22,917	11,876
Other accrued expenses	44,573	61,617
Total accrued liabilities	$ 184,243	$ 204,786