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Subsequent Event (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 28, 2015
Subsequent Event [Line Items] |  |  |  |
Payments for Repurchase of Common Stock | $ 12,321 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 1,328 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 1,656 us-gaap_PaymentsForRepurchaseOfCommonStock |
Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Stock Repurchased |  |  |  | 141,462 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Payments for Repurchase of Common Stock |  |  |  | $ 3,800 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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Balance Type: | credit
Period Type: | duration

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 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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- Details
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Balance Type: | na
Period Type: | duration

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- Details
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