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Capital Stock (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |
Common stock, shares authorized | 100,000,000 | 100,000,000 |
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |
Preferred stock, shares authorized | 5,000,000 |  |
Preferred stock, par value | $ 0.01 |  |
Common Stock, Shares, Outstanding | 78,855,547 | 78,112,032 | 77,423,415
Treasury stock, shares held | 2,478,084 | 2,334,137 | 2,249,959
Preferred stock, shares issued | 0 |  |
Common Shares Outstanding and Treasury Shares Held Rollforward [Table] |  |  |
Common shares outstanding, beginning balance | 78,112,032 | 77,423,415 | 76,291,745
Exercise of common stock options, net | 373,106 | 580,097 | 858,727
Grants of restricted stock, net | 370,409 | 108,520 | 272,943
Common shares outstanding, ending balance | 78,855,547 | 78,112,032 | 77,423,415
Treasury stock, beginning balance | 2,334,137 | 2,249,959 | 1,533,653
Shares received upon exercise of common stock options | 119,477 | 81,616 | 592,992
Shares received upon vesting of restricted stock, net | 24,470 | 2,562 | 123,314
Treasury stock, ending balance | 2,478,084 | 2,334,137 | 2,249,959
Amount authorized under stock repurchase program | $ 20,000,000 |  |
Amount repurchased under the stock repurchase program in the period | $ 0 |  |

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- Definition The number of shares surrendered in payment of stock option exercises, including the cost of the options and tax withholdng, which are included in treasury stock, net of the number of treasury shares issued pursuant to stock option exercises. + References No definition available. + Details
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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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