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v3.20.4

Debt (Additional Information) (Details) |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 16, 2020 USD ($) | Oct. 02, 2020 USD ($) | Feb. 17, 2017 USD ($) fiscal_quarter | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings under revolving credit facility |  |  |  |  | $ 25,000,000 | $ 25,000,000 | $ 123,000,000 |  |
Interest expense on debt |  |  |  |  |  | 6,500,000 | 7,200,000 | $ 6,100,000 |
Line of credit fees |  |  |  |  |  | 715,000 | 576,000 | 573,000 |
Debt issuance amortization costs |  |  |  |  |  | 593,000 | 552,000 | 552,000 |
Revolving Credit Facility | Third Amended Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  | 5 years |  |  |  |  |  |
Credit agreement, maximum borrowing capacity |  |  | $ 450,000,000.0 |  |  |  |  |  |
Line of credit facility, additional borrowing capacity |  |  | $ 175,000,000.0 |  |  |  |  |  |
Debt instrument, lower range basis spread on variable rate |  |  | 0.375% |  |  |  |  |  |
Debt instrument, higher range basis spread on variable rate |  |  | 0.75% |  |  |  |  |  |
Leverage ratio, maximum |  |  | 3.25 |  |  |  |  |  |
Maximum leverage ratio option |  |  | 3.50 |  |  |  |  |  |
One-time leverage ratio maximum option, number of fiscal quarters for period of increased maximum leverage ratio | fiscal_quarter |  |  | 3 |  |  |  |  |  |
Interest coverage ratio, minimum |  |  | 3.00 |  |  |  |  |  |
Leverage ratio, cash dividends, maximum |  |  | 2.75 |  |  |  |  |  |
Borrowings |  |  |  | $ 150,000,000.0 | 0 |  |  |  |
Repayments of lines of credit |  |  |  |  |  | 248,000,000.0 | 105,500,000 | 5,000,000.0 |
Borrowings under revolving credit facility |  |  |  |  | $ 25,000,000.0 | $ 25,000,000.0 |  |  |
Revolving Credit Facility | Third Amended Credit Agreement | Interest rate swap contract |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Derivative, amount of hedged item |  |  |  |  |  |  |  |  | $ 75,000,000.0
Settlement of interest rate swap |  | $ 2,400,000 |  |  |  |  |  |  |
Revolving Credit Facility | Third Amended Credit Agreement | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unused commitment fee, percentage |  |  | 0.20% |  |  |  |  |  |
Revolving Credit Facility | Third Amended Credit Agreement | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unused commitment fee, percentage |  |  | 0.30% |  |  |  |  |  |
Allowed dividend payments |  |  | $ 20,000,000.0 |  |  |  |  |  |
Revolving Credit Facility | Third Amended Credit Agreement | Eurocurrency loans |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
LIBOR spread minimum |  |  | 1.375% |  |  |  |  |  |
LIBOR spread maximum |  |  | 1.75% |  |  |  |  |  |
Revolving Credit Facility | Third Amended Credit Agreement | Federal Funds Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate spread over variable rate |  |  | 0.50% |  |  |  |  |  |
Revolving Credit Facility | Third Amended Credit Agreement | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate spread over variable rate |  |  | 1.00% |  |  |  |  |  |
Revolving Credit Facility | Fourth Amended and Restated Credit Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit agreement, maximum borrowing capacity | $ 450,000,000.0 |  |  |  |  |  |  |  |
Line of credit facility, additional borrowing capacity | $ 175,000,000.0 |  |  |  |  |  |  |  |
Debt instrument, lower range basis spread on variable rate | 0.625% |  |  |  |  |  |  |  |
Debt instrument, higher range basis spread on variable rate | 1.00% |  |  |  |  |  |  |  |
Leverage ratio, maximum | 3.25 |  |  |  |  |  |  |  |
Maximum leverage ratio option | 3.50 |  |  |  |  |  |  |  |
Interest coverage ratio, minimum | 3.00 |  |  |  |  |  |  |  |
Leverage ratio, cash dividends, maximum | 2.75 |  |  |  | 2.75 | 2.75 |  |  |
One-time leverage ratio maximum option, period of increased maximum leverage ratio | 1 year |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  | $ 2,300,000 | $ 2,300,000 | 1,200,000 |  |
Debt issuance amortization costs |  |  |  |  |  | $ 600,000 | $ 600,000 | $ 600,000 |
Revolving Credit Facility | Fourth Amended and Restated Credit Agreement | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unused commitment fee, percentage | 0.25% |  |  |  |  |  |  |  |
Revolving Credit Facility | Fourth Amended and Restated Credit Agreement | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unused commitment fee, percentage | 0.35% |  |  |  |  |  |  |  |
Allowed dividend payments | $ 20,000,000.0 |  |  |  |  |  |  |  |
Revolving Credit Facility | Fourth Amended and Restated Credit Agreement | Eurocurrency loans |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
LIBOR spread minimum | 1.625% |  |  |  |  |  |  |  |
LIBOR spread maximum | 2.00% |  |  |  |  |  |  |  |
Revolving Credit Facility | Fourth Amended and Restated Credit Agreement | Federal Funds Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate spread over variable rate | 0.50% |  |  |  |  |  |  |  |
Revolving Credit Facility | Fourth Amended and Restated Credit Agreement | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate spread over variable rate | 1.00% |  |  |  |  | 1.625% |  |  |

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