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Debt - Revolving Loan (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Outstanding unamortized loan fees		$ 83,000
Long-term debt	$ 464,848,000	282,196,000
Credit Facility
Debt Instrument [Line Items]
Long-term debt	0	0
Borrowing capacity	25,000,000
Prepaid expenses and other current assets
Debt Instrument [Line Items]
Outstanding unamortized loan fees	$ 64,000	74,000
Noncurrent assets
Debt Instrument [Line Items]
Outstanding unamortized loan fees		$ 9,000

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

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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