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Stockholders' Equity - Share Repurchase Program (Details) (USD $) | 12 Months Ended |  |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2011
Equity [Abstract] |  |  |  |
Common stock repurchase authorization amount available |  |  | $ 98,100,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |
Common stock repurchase authorized amount |  |  |  | 150,000,000.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1
Common stock repurchased and retired, shares | 171,263 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | 1,507,659 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares |  |
Common stock repurchased and retired, weighted average price per share | $ 45.54 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 29.96 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |
Common stock repurchased and retired, total value | $ 7,800,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue | $ 45,200,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |  |

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- Details
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- Definition Number of shares that have been repurchased and retired during the period. + 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 Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + 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, 31 -Article 5 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + 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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