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Long-term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Term loans $ 998,000 $ 1,000,000
Capital lease obligations 5,673 5,839
Notes payable 639 1,159
Total long-term debt 1,004,312 1,006,998
Less unamortized discount (29,003) (30,122)
Less unamortized debt issuance costs (3,769) (3,917)
Long-term Debt 971,540 972,959
Less current maturities (9,235) (9,759)
Long-term debt, net $ 962,305 $ 963,200