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Stock Repurchase Program (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 17, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 02, 2016 | Nov. 04, 2014
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Aggregate purchase price for repurchased shares |  | $ 53,035,000 | $ 0 | $ 0 |  |
2016 and 2014 Share Repurchase Programs |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Remaining value of shares authorized for repurchase under stock repurchase programs |  | $ 54,900,000 |  |  |  |
Number of shares repurchased (in shares) |  | 0 | 0 | 0 |  |
2016 Repurchase Program |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Value of shares authorized for repurchase under stock repurchase programs |  |  |  |  | $ 50,000,000.0 |
2014 Share Repurchase Program |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Value of shares authorized for repurchase under stock repurchase programs |  |  |  |  |  | $ 50,000,000.0
One-Time Stock Repurchase Transaction |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Value of shares authorized for repurchase under stock repurchase programs | $ 75,000,000.0 |  |  |  |  |
Number of shares repurchased (in shares) | 749,300 |  |  |  |  |
Average price of repurchased shares (in dollars per share) | $ 70.78 |  |  |  |  |
Aggregate purchase price for repurchased shares | $ 53,000,000.0 |  |  |  |  |

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