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Shareholders' Equity (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Jul. 21, 2016
Shareholders' Equity [Line Items] |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  |  | 3,000,000
Stock Repurchased and Retired During Period, Shares | 364,286 |  |  |  | 204,809 |
Stock Repurchased and Retired During Period, In Total Dollars | $ 19,993,000 |  |  |  | $ 9,996,000 |
Stock repurchased, common stock acquired, average cost per share | $ 54.88 |  |  |  | $ 48.81 |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 1,454,379 |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |
Shareholders' Equity [Line Items] |  |  |  |  |  |
Dividends per share (in dollars per share) | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 |

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