Term Loan and Credit Facility - Carrying Value (Details) - USD ($)	Sep. 30, 2021	Mar. 03, 2021	Jan. 01, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Less: debt issuance costs, net			$ (300,000)	$ (3,200,000)
Medium-term Notes | Term Facility
Debt Instrument [Line Items]
Principal		$ 150,000,000
Debt Instrument, Tranche One | Medium-term Notes | Term Facility
Debt Instrument [Line Items]
Principal	$ 150,000,000
Less: debt issuance costs, net	(1,943,000)
Net carrying amount	$ 148,057,000