Long-Term Obligations - Long-term Obligations (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Summary of long-term obligations
Debt obligations	$ 1,264,333	$ 811,097
Other Debt	1,801	0
Capital lease obligations	83,384	55,244
Total Debt and Capital Lease Obligations	1,347,717	866,341
Less — current portion	(38,320)	(33,623)
Current portion of long-term debt	1,309,397	832,718
Revolving line of credit
Summary of long-term obligations
Principal amount	400,000	232,000
Less unamortized debt issuance costs	(4,093)	(3,725)
Debt obligations	$ 395,907	$ 228,275
Effective interest rate (percentage)	2.28%	1.92%
Senior term notes
Summary of long-term obligations
Principal amount	$ 869,000	$ 585,000
Less unamortized debt issuance costs	(2,605)	(2,408)
Debt obligations	$ 866,395	$ 582,592
Effective interest rate (percentage)	2.28%	1.92%
Secured Seller Notes
Summary of long-term obligations
Principal amount	$ 230	$ 230
Stated interest rate (percentage)	10.00%