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Long-term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Term loans $ 994,000 $ 1,000,000
Capital lease obligations 5,238 5,839
Notes payable 426 1,159
Total long-term debt 999,664 1,006,998
Less unamortized discount (26,771) (30,122)
Less unamortized debt issuance costs (3,564) (3,917)
Long-term Debt 969,329 972,959
Less current maturities (8,859) (9,759)
Long-term debt, net $ 960,470 $ 963,200