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Long-term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Term loans $ 992,000 $ 1,000,000
Capital lease obligations 7,127 5,839
Notes payable 1,111 1,159
Total long-term debt 1,000,238 1,006,998
Less unamortized discount (25,658) (30,122)
Less unamortized debt issuance costs (3,537) (3,917)
Long-term Debt 971,043 972,959
Less current maturities (10,480) (9,759)
Long-term debt, net $ 960,563 $ 963,200