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Long-Term Debt and Credit Facilities - Summary (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 14, 2018	Apr. 03, 2018	Dec. 31, 2017
Long-term debt
Long term debt gross	$ 695,616
Less debt issuance costs	(13,656)			$ (19,679)
Total long-term debt	681,960			835,954
Less current portion of long-term debt	(7,416)			(75,008)
Total long-term debt, long-term portion	674,544			760,946
Deferred purchase price
Long-term debt
Long term debt gross				68,720
Letter of credit
Long-term debt
Long term debt gross				1,000
First lien senior secured credit facility \| Term loan
Long-term debt
Long term debt gross	656,404			566,075
Less debt issuance costs			$ (900)
First lien senior secured credit facility \| Credit Facility
Long-term debt
Long term debt gross	$ 39,212			44,632
Less debt issuance costs		$ (1,200)
Second lien senior secured credit facility \| Term loan
Long-term debt
Long term debt gross				$ 175,206