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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of compensation expense and stock award activity |
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2012 |  | 2011 |  | 2012 |  | 2011
Stock-based compensation expense | $ | 2,822 |  |  | $ | 2,114 |  |  | $ | 6,095 |  |  | $ | 5,215 |
Non-vested shares granted | 16,750 |  |  | 0 |  |  | 386,500 |  |  | 357,000 |
Performance-based non-vested shares granted | 0 |  |  | 0 |  |  | 56,250 |  |  | 56,250 |
Stock options exercised | 179,832 |  |  | 3,000 |  |  | 259,132 |  |  | 119,600 |
Restricted stock awards vested (includes performance-based awards) | 3,300 |  |  | 12,634 |  |  | 200,316 |  |  | 166,751 |
Summary of stock based compensation agreements |
| As of
| September 30, 2012 |  | December 31, 2011
Unrecognized stock-based compensation cost | $ | 13,468 |  |  | $ | 9,058 |
Weighted average years remaining vesting period | 2.33 |  |  | 2.05 |
Total equity awards outstanding (1) | 1,650,135 |  |  | 1,738,533 |
(1) | Includes vested and unvested options outstanding and unvested restricted stock awards

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the total compensation cost related to nonvested awards not yet recognized and the weighted-average period over which it is expected to be recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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