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Financial Instruments - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Derivative [Line Items]
Long-term debt	$ 326,286,000		$ 326,286,000		$ 375,397,000
Net loss recorded in accumulated other comprehensive income	(930,000)	$ (1,303,000)	(3,032,000)	$ 7,876,000
Interest Rate Swap
Derivative [Line Items]
Net loss recorded in accumulated other comprehensive income			3,790,000
Secured Debt | Interest Rate Swap
Derivative [Line Items]
Derivative, notional amount	275,000,000		275,000,000
Secured Debt | Term Loan Facility
Derivative [Line Items]
Long-term debt	$ 310,944,000		$ 310,944,000		$ 355,000,000

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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+ References

No definition available.

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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- Definition

Amount, before tax and after reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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