Long-Term Obligations - Summary of Long-Term Obligations (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Debt obligations less unamortized discount and debt issuance costs	$ 1,293,717	$ 1,264,333
Other Debt	1,418	1,801
Capital lease obligations	81,041	83,384
Long-term debt and capital lease obligations, including current maturities	1,374,758	1,347,717
Less — current portion	(49,347)	(38,320)
Current potion of long-term debt	1,325,411	1,309,397
Revolving credit
Debt Instrument [Line Items]
Principal amount	440,000	400,000
Less unamortized debt issuance costs	(3,638)	(4,093)
Debt obligations less unamortized discount and debt issuance costs	$ 436,362	$ 395,907
Effective interest rate (percentage)	2.73%	2.28%
Senior term notes
Debt Instrument [Line Items]
Principal amount	$ 858,000	$ 869,000
Less unamortized debt issuance costs	(2,293)	(2,605)
Debt obligations less unamortized discount and debt issuance costs	$ 855,707	$ 866,395
Effective interest rate (percentage)	2.73%	2.28%
Secured seller note
Debt Instrument [Line Items]
Debt obligations less unamortized discount and debt issuance costs	$ 230	$ 230
Stated interest rate (percentage)	10.00%	10.00%