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Stock Repurchase Plan (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 30, 2003
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Repurchase of common stock | $ 247,000 |  |  |
Stock repurchased, average price per share (in dollars per share) | $ 139.78 |  |  |
Stock Repurchase Plan |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Authorized common stock for repurchases, amount |  |  |  | $ 15,000,000
Remaining authorized share for repurchases, amount | $ 250,000,000 |  |  |
Repurchase of common stock | $ 200,000 |  |  |
Number of shares repurchased | 1,769 | 0 | 0 |

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