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Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 11 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 16, 2015 | Nov. 27, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2009
Common Stock Repurchase |  |  |  |  |  |  |
Repurchase of common stock authorized by Board of Directors |  |  |  |  |  | $ 100,000 | $ 100,000
Number of years for repurchase of common stock |  |  |  |  |  | 5 years |
Common stock repurchased, value |  |  | $ 16,500 | $ 5,352 | $ 5,918 |  |
Common Stock |  |  |  |  |  |  |
Common Stock Repurchase |  |  |  |  |  |  |
Common stock repurchased (in shares) |  |  | 912,000 | 249,000 | 395,000 |  |
Common stock repurchased, value |  |  | $ 9 | $ 2 | $ 4 |  |
Dutch Auction [Member] |  |  |  |  |  |  |
Common Stock Repurchase |  |  |  |  |  |  |
Common stock repurchased (in shares) |  |  | 643,821 |  |  |  |
Common stock repurchased, value | $ 11,600 |  | $ 16,500 |  |  |  |
Weighted average price per share (in dollars per share) |  |  | $ 17.75 |  |  |  |
Share Price | $ 18.00 |  |  |  |  |  |
Dutch Auction [Member] | Minimum |  |  |  |  |  |  |
Common Stock Repurchase |  |  |  |  |  |  |
Weighted average price per share (in dollars per share) |  | $ 15.50 |  |  |  |  |
Dutch Auction [Member] | Maximum |  |  |  |  |  |  |
Common Stock Repurchase |  |  |  |  |  |  |
Weighted average price per share (in dollars per share) |  | $ 18.00 |  |  |  |  |

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- Definition Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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