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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 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Total Number of Shares Purchased | 240,933 | 4,490 | 173,288 | 900,997 | 283,343 | 82,100 | 1,319,708 | 283,343 | 82,100 | 1,685,151
Average Price Paid Per Share | $ 46.30 | $ 47.92 | $ 49.92 | $ 49.70 | $ 49.43 | $ 34.57 |  |  |  | $ 48.45
Maximum Dollar Value of Shared That May Yet Be Purchased Under the Program |  |  |  |  |  |  | $ 31,000 |  |  | $ 31,000
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 | 82,100 |  |  |  | 1,685,151
Maximum Dollar Value of Shared That May Yet Be Purchased Under the Program |  |  |  |  |  |  | $ 30,710 |  |  | $ 30,710

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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