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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of compensation expense and stock award activity |
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Stock-based compensation expense | $ | 2,097 |  |  | $ | 1,620 |  |  | $ | 3,941 |  |  | $ | 3,273 |
Non-vested shares granted | 10,000 |  |  | 20,500 |  |  | 342,100 |  |  | 369,750 |
Performance-based non-vested shares granted | — |  |  | — |  |  | 62,500 |  |  | 56,250 |
Stock options exercised | 199,827 |  |  | 10,600 |  |  | 322,100 |  |  | 79,300 |
Restricted stock awards vested (includes performance-based awards) | 6,200 |  |  | 3,400 |  |  | 280,800 |  |  | 197,016 |
Summary of stock based compensation agreements |
| As of
| June 30, 2013 |  | December 31, 2012
Unrecognized stock-based compensation cost | $ | 21,513 |  |  | $ | 13,072 |
Weighted average years remaining vesting period | 2.66 |  |  | 2.17 |
Total equity awards outstanding (1) | 1,367,985 |  |  | 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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