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Stock Repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Aug. 02, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Total number of shares repurchased | 0 | 1,424,000 | 884,000 |
Dollar amount of shares repurchased |  | $ 50,021 | $ 24,091 |
Average price paid per share |  | $ 35.13 | $ 27.24 |
August 2012 Stock Repurchase Program |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Stock repurchases program, authorized amount |  |  |  | $ 50,000
2016 and 2014 Share Repurchase Programs [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Stock repurchase program, remaining authorized repurchase amount | $ 54,900 |  |  |

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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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