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v3.21.2

Debt (Additional Information) (Details) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Oct. 16, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowings under revolving credit facility |  | $ 0 |  | $ 0 |  | $ 25,000,000
Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Outstanding line of credit issuance costs |  | $ 2,000,000.0 |  | $ 2,000,000.0 |  | $ 2,300,000
Revolving Credit Facility | Fourth Amended and Restated Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity | $ 450,000,000.0 |  |  |  |  |
Additional borrowing capacity | $ 175,000,000.0 |  |  |  |  |
Variable rate lower range, basis spread | 0.625% |  |  |  |  |
Variable rate higher range, basis spread | 1.00% |  |  |  |  |
Leverage ratio | 3.25 |  |  |  |  |
One-time leverage ratio maximum option | 3.50 |  |  |  |  |
One-time leverage ratio maximum option, period of increased maximum leverage ratio | 1 year |  |  |  |  |
ICR covenant limit | 3.00 |  |  |  |  |
Amount of unrestricted domestic cash and cash equivalents permitted to net against indebtedness in calculation of total net leverage ratio (up to) | 50,000,000.0 |  |  |  |  |
Debt instrument, leverage ratio, maximum | 2.75 | 2.75 |  | 2.75 |  |
Borrowings |  | $ 0 |  | $ 0 |  |
Revolving Credit Facility | Fourth Amended and Restated Credit Agreement | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Unused capacity, commitment fee percentage | 0.25% |  |  |  |  |
Revolving Credit Facility | Fourth Amended and Restated Credit Agreement | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Unused capacity, commitment fee percentage | 0.35% |  |  |  |  |
Allowed restricted payments, including cash dividends | $ 20,000,000.0 |  |  |  |  |
Revolving Credit Facility | Fourth Amended and Restated Credit Agreement | Eurocurrency loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit, LIBOR rate, minimum basis spread | 1.625% |  |  |  |  |
Line of credit, LIBOR rate, maximum basis spread | 2.00% |  |  |  |  |
Revolving Credit Facility | Fourth Amended and Restated Credit Agreement | Federal Funds Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate (percent) | 0.50% |  |  |  |  |
Revolving Credit Facility | Fourth Amended and Restated Credit Agreement | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate (percent) | 1.00% |  |  | 1.625% |  |
Revolving Credit Facility | Third Amended Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowings |  |  | $ 150,000,000.0 |  |  |
Discretionary principal payments on revolving credit facility |  | $ 4,000,000.0 | $ 50,000,000.0 | $ 25,000,000.0 | $ 50,000,000.0 |

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