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Share Repurchases (Details) - USD ($) | 9 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Share Repurchases [Line Items] |  |
Purchase of common stock | $ 52,916,000 | $ 23,280,000
February 2018 Authorization [Member] |  |
Share Repurchases [Line Items] |  |
Number of shares authorized to be repurchased |  | 20,000,000
Share repurchases | 548,659 | 261,807
Purchase of common stock | $ 52,916,000 | $ 23,280
Treasury Stock Acquired, Average Cost Per Share | $ 96.45 | $ 88.92
Remaining number of shares authorized to be repurchased | 7,811,385 |

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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