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Supplemental Disclosures - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2020 | Mar. 31, 2020
Payments for Repurchase of Equity [Abstract] |  |  |  |
Repurchases of common stock | $ 3,363,000 | $ 1,898,000 |  |
Investments in mutual funds | 26,100,000 |  |  |
Interest paid | 200,000 | 200,000 |  |
Income taxes paid | $ 4,100,000 | $ 6,300,000 |  |
Restricted Stock Units (RSUs) |  |  |  |
Payments for Repurchase of Equity [Abstract] |  |  |  |
Granted (in shares) | 257,000 |  |  |
Vesting period | 4 years |  | 5 years |
Performance-based RSUs |  |  |  |
Payments for Repurchase of Equity [Abstract] |  |  |  |
Granted (in shares) | 85,000 |  |  |
Vesting period | 3 years |  |  |
Common Stock |  |  |  |
Payments for Repurchase of Equity [Abstract] |  |  |  |
Common shares repurchased (in shares) | 52,000 | 26,000 |  |
Repurchases of common stock | $ 3,400,000 | $ 1,900,000 |  |
Stock Repurchase Program, March 2020 | Common Stock |  |  |  |
Payments for Repurchase of Equity [Abstract] |  |  |  |
Stock repurchase programs, authorized amount |  |  |  | $ 200,000,000
Remaining authorized repurchase amount | $ 146,700,000 |  |  |

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