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Capital Stock (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014
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 | 79,649,946 | 78,855,547 | 78,112,032 | 80,256,670 | 79,649,946
Treasury stock, shares held | 2,672,930 | 2,478,084 | 2,334,137 | 2,766,958 | 2,672,930
Preferred stock, shares issued |  |  |  | 0 |
Common Shares Outstanding and Treasury Shares Held Rollforward [Table] |  |  |  |  |
Common shares outstanding, beginning balance | 79,649,946 | 78,855,547 | 78,112,032 |  |
Exercise of common stock options, net | 67,808 | 290,369 | 373,106 |  |
Grants of restricted stock, net | 538,916 | 504,030 | 370,409 |  |
Common shares outstanding, ending balance | 80,256,670 | 79,649,946 | 78,855,547 |  |
Treasury stock, beginning balance | 2,672,930 | 2,478,084 | 2,334,137 |  |
Shares received upon exercise of common stock options | 36,818 | 189,469 | 119,477 |  |
Shares received upon vesting of restricted stock, net | 57,210 | 5,377 | 24,470 |  |
Treasury stock, ending balance | 2,766,958 | 2,672,930 | 2,478,084 |  |
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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