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Stockholders' Equity Repurchases of Common Stock (Details) (USD $) | 0 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 11, 2013 | Nov. 30, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2012
Stockholders' Equity Note [Abstract] |  |  |  |  |  |
Treasury stock, shares acquired | 600,000 us-gaap_TreasuryStockSharesAcquired | 256,262 us-gaap_TreasuryStockSharesAcquired |  | 873,146 us-gaap_TreasuryStockSharesAcquired | 600,000 us-gaap_TreasuryStockSharesAcquired | 1,129,408 us-gaap_TreasuryStockSharesAcquired
Treasury stock acquired, average price paid per share | $ 13.18 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 21.58 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 24.26 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  | $ 23.65 us-gaap_TreasuryStockAcquiredAverageCostPerShare |
Stock repurchase program, remaining authorized repurchase amount |  |  | $ 0 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 | $ 0 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  | $ 0 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

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- Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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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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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + 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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