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Share Repurchases Share Repurchase Program (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended
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Feb. 20, 2015 | Apr. 29, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ 150 us-gaap_StockRepurchaseProgramAuthorizedAmount | $ 150,000 us-gaap_StockRepurchaseProgramAuthorizedAmount |  |  |
Stock Repurchased During Period, Shares |  |  | 4,261 us-gaap_StockRepurchasedDuringPeriodShares |  |
Treasury Stock Acquired, Average Cost Per Share |  |  | $ 33.38 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |
Stock Repurchased During Period, Value |  |  | 142,228 us-gaap_PaymentsForRepurchaseOfCommonStock | 102,172 us-gaap_PaymentsForRepurchaseOfCommonStock | 0 us-gaap_PaymentsForRepurchaseOfCommonStock
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  | $ 49,764 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount |  |

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- Details
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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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- 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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- Definition Amount of a stock repurchase plan authorized by an entity's Board of Directors. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized by an entity's Board of Directors. + 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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