Long-Term Debt and Lines of Credit - Summary (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Long-term debt
Long term debt gross	$ 686,941
Less debt issuance costs	(11,254)	$ (12,985)
Total long-term debt	675,687	684,056
Less current portion of long-term debt	(5,448)	(7,191)
Total long-term debt, long-term portion	670,239	676,865
Senior Secured Credit Facilities \| Term loan
Long-term debt
Face amount of debt	665,000
Senior Secured Credit Facilities \| Credit Facility
Long-term debt
Commitments	200,000
First lien senior secured credit facility \| Term loan
Long-term debt
Long term debt gross	651,468	654,775
First lien senior secured credit facility \| Credit Facility
Long-term debt
Long term debt gross	$ 35,473	$ 42,266

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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