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Long-Term Debt and Credit Facilities - Summary (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 14, 2018	Apr. 03, 2018	Dec. 31, 2017
Long-term debt
Long term debt gross	$ 726,665
Less debt issuance costs	(13,938)			$ (19,679)
Total long-term debt	712,727			864,517
Less current portion of long-term debt	(45,056)			(103,571)
Total long-term debt, long-term portion	667,671			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
Settlement facilities
Long-term debt
Long term debt gross	38,154			28,563
First lien senior secured credit facility \| Term loan
Long-term debt
Long term debt gross	657,946			566,075
Less debt issuance costs			$ (900)
First lien senior secured credit facility \| Credit Facility
Long-term debt
Long term debt gross	$ 30,565			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