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Long-Term Debt and Revolving Line of Credit - Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument
Long-term debt, Gross	$ 301,245
Less: debt issuance costs	(6,042)	$ (5,319)
Total	295,203	298,780
Current portion of long-term debt	(3,020)	(4,680)
Long-term debt, net of current portion and debt issuance costs	292,183	294,100
Term Loan
Debt Instrument
Long-term debt, Gross	$ 301,245	$ 304,099

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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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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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