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Debt and Credit Agreement - Narrative (Details)			1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 22, 2020 USD ($)	Nov. 15, 2019 USD ($)	Nov. 30, 2019 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Debt issuance costs incurred and capitalized						$ 0	$ 550,000
Amortization of debt issuance costs						2,570,000	754,000
Line of Credit
Debt Instrument [Line Items]
Debt issuance costs incurred and capitalized						0
Amortization of debt issuance costs				$ 300,000	$ 200,000	800,000	$ 700,000
Line of Credit | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank
Debt Instrument [Line Items]
Debt issuance costs incurred and capitalized	$ 600,000		$ 2,300,000
Line of Credit | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank | Minimum
Debt Instrument [Line Items]
Commitment fee rate on undrawn commitments		0.15%
Line of Credit | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank | Maximum
Debt Instrument [Line Items]
Commitment fee rate on undrawn commitments		0.30%
Line of Credit | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank | LIBOR
Debt Instrument [Line Items]
Spread on variable interest rate		1.00%
Line of Credit | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank | LIBOR | Minimum
Debt Instrument [Line Items]
Spread on variable interest rate		1.25%
Line of Credit | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank | LIBOR | Maximum
Debt Instrument [Line Items]
Spread on variable interest rate		2.00%
Line of Credit | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank | Federal Funds
Debt Instrument [Line Items]
Spread on variable interest rate		0.50%
Line of Credit | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank | LIBOR Plus 1.00% | Minimum
Debt Instrument [Line Items]
Spread on variable interest rate		0.25%
Line of Credit | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank | LIBOR Plus 1.00% | Maximum
Debt Instrument [Line Items]
Spread on variable interest rate		1.00%
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Outstanding balance for revolving credit				$ 0		$ 0		$ 0
Line of Credit | Revolving Credit Facility | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank
Debt Instrument [Line Items]
Term of debt instrument		5 years
Maximum borrowing capacity		$ 500,000,000
Line of Credit | Revolving Credit Facility | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank | Calendar Quarters Up To and Including March 31, 2021
Debt Instrument [Line Items]
Maximum secured net leverage ratio	3.50
Line of Credit | Revolving Credit Facility | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank | Calendar Quarters After March 31, 2021
Debt Instrument [Line Items]
Maximum secured net leverage ratio	3.00
Line of Credit | Incremental Loan Facility | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank
Debt Instrument [Line Items]
Maximum borrowing capacity		250,000,000
Line of Credit | Letter of Credit | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank
Debt Instrument [Line Items]
Maximum borrowing capacity		15,000,000
Line of Credit | Swing Line Loan | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 25,000,000

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