Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accrued Liabilities, Current [Abstract]
Interest	$ 40,240	$ 15,770
Employee related costs	98,516	122,590
Income taxes payable	17,376	43,083
Other accrued expenses	96,363	102,986
Total accrued liabilities	$ 252,495	$ 284,429