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Debt and Credit Agreement - Narrative (Details)			1 Months Ended	3 Months Ended
	Sep. 22, 2020 USD ($)	Nov. 15, 2019 USD ($)	Nov. 30, 2019 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Amortization of debt issuance costs				$ 849,000	$ 241,000
Line of Credit
Debt Instrument [Line Items]
Debt issuance costs incurred and capitalized				0
Amortization of debt issuance costs				300,000	$ 200,000
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				$ 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		$ 500,000,000.0
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 | Letter of Credit | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank
Debt Instrument [Line Items]
Maximum borrowing capacity		15,000,000.0
Line of Credit | Swing Line Loan | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank
Debt Instrument [Line Items]
Maximum borrowing capacity		25,000,000.0
Line of Credit | Incremental Loan Facility | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 250,000,000.0

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Debt Instrument, Covenant, Maximum Secured Net Leverage Ratio

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Amount of amortization expense attributable to debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-Topic 220
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Section 45
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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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