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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Accrued Liabilities, Current [Abstract]    
Interest $ 29,911 $ 30,262
Employee related costs 71,850 117,850
Income taxes payable 17,225 19,558
Other accrued expenses 97,495 95,406
Total accrued liabilities $ 216,481 $ 263,076