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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of compensation expense and stock award activity |
| Three Months Ended September 30 |  | Nine Months Ended September 30
| 2013 |  | 2012 |  | 2013 |  | 2012
Stock-based compensation expense | $ | 3,099 |  |  | $ | 2,822 |  |  | $ | 7,040 |  |  | $ | 6,095 |
Non-vested shares granted | 3,600 |  |  | 16,750 |  |  | 345,700 |  |  | 386,500 |
Performance-based non-vested shares granted | — |  |  | — |  |  | 62,500 |  |  | 56,250 |
Stock options exercised | 12,400 |  |  | 179,832 |  |  | 334,500 |  |  | 259,132 |
Restricted stock awards vested (includes performance-based awards) | 2,550 |  |  | 3,300 |  |  | 283,350 |  |  | 200,316 |
Summary of stock based compensation agreements |
| As of
| September 30, 2013 |  | December 31, 2012
Unrecognized stock-based compensation cost | $ | 19,529 |  |  | $ | 13,072 |
Weighted average years remaining vesting period | 2.40 |  |  | 2.17 |
Total equity awards outstanding (1) | 1,328,885 |  |  | 1,615,235 |
(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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