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Long-term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Term loans $ 996,000 $ 1,000,000
Capital lease obligations 5,434 5,839
Notes payable 529 1,159
Total long-term debt 1,001,963 1,006,998
Less unamortized discount (27,886) (30,122)
Less unamortized debt issuance costs (3,696) (3,917)
Long-term Debt 970,381 972,959
Less current maturities (9,038) (9,759)
Long-term debt, net $ 961,343 $ 963,200