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Stock Repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended | 36 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Aug. 26, 2017 | Apr. 01, 2017 | Feb. 25, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Total Number of Shares Purchased | 240,933 | 4,490 | 173,288 | 900,997 | 283,343 | 1,319,708 | 283,343 | 1,603,051 |
Average Price Paid Per Share | $ 46.30 | $ 47.92 | $ 49.92 | $ 49.70 | $ 49.43 |  |  | $ 49.16 |
Maximum Dollar Value of Shared That May Yet Be Purchased Under the Program |  |  |  |  |  |  |  |  | $ 89,000
Publicly Announced Program [Member] |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Total Number of Shares Purchased | 240,933 | 4,490 | 173,288 | 900,997 | 283,343 |  |  | 1,603,051 |
Maximum Dollar Value of Shared That May Yet Be Purchased Under the Program |  |  |  |  |  | $ 88,710 |  | $ 88,710 |

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