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Common Stock (Details) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2009 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2008
Class of Stock Disclosures [Abstract] |  |  |  |
Common stock authorized by the Board of Directors (in shares) | 1,200,000 |  |  | 2,250,000
Total purchased shares (in shares) | 859,499 | 0 | 0 |
Additional estimated shares (in shares) |  | 131,176 |  |
Closing price (in dollars per share) |  | $ 114.35 |  |
Maximum [Member] |  |  |  |
Class of Stock Disclosures [Abstract] |  |  |  |
Percentage of repurchase of common stock | 10.00% |  |  |
Bank credit agreement to permit share repurchases of common stock | $ 15,000,000 |  |  |

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