Revolving Credit Facility - Narrative (Details) - Revolving Credit Facility - Credit Agreement	9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Line of Credit Facility [Line Items]
Revolving credit facility expiration period		3 years
Maximum borrowing capacity		$ 150,000,000
Additional borrowing capacity, increase limit		200,000,000
Additional borrowing capacity, higher borrowing capacity option		$ 350,000,000
Amounts outstanding	$ 0
Remaining borrowing capacity	$ 150,000,000
Restrictive covenants, fixed charge coverage ratio	1.0
Restrictive covenants, fixed charge coverage ratio, calculation period	12 months
Restrictive covenants in future periods if available commitments are less than, amount	$ 15,000,000
Restrictive covenants in future period if available commitments are less than percent (in percentage)	0.10
Minimum | Alternative Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate (percentage)	1.50%
Minimum | REVLIBOR30 Screen Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate (percentage)	1.50%
Minimum | Rate Based on Fixed Charge Coverage Ratio
Line of Credit Facility [Line Items]
Basis spread on variable rate (percentage)	0.00%
Maximum | Alternative Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate (percentage)	2.00%
Maximum | REVLIBOR30 Screen Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate (percentage)	2.00%
Maximum | Rate Based on Fixed Charge Coverage Ratio
Line of Credit Facility [Line Items]
Basis spread on variable rate (percentage)	0.50%