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Stock Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2012
Stock-Based Compensation [Abstract] |
Summary of compensation expense and stock award activity |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Stock-based compensation expense |  | $ | 1,620 |  |  | $ | 1,388 |  |  | $ | 3,273 |  |  | $ | 3,101 |
Non-vested shares granted |  |  | 20,500 |  |  |  | 13,250 |  |  |  | 369,750 |  |  |  | 357,000 |
Performance-based non-vested shares granted |  |  | 0 |  |  |  | 0 |  |  |  | 56,250 |  |  |  | 56,250 |
Stock options exercised |  |  | 10,600 |  |  |  | 19,550 |  |  |  | 79,300 |  |  |  | 116,600 |
Restricted stock awards vested (includes performance-based awards) |  |  | 3,400 |  |  |  | 2,050 |  |  |  | 197,016 |  |  |  | 154,117 |
Summary of stock based compensation agreements |
|  | As of |
|  | June 30, 2012 |  |  | December 31, 2011 |
Unrecognized stock-based compensation cost |  | $ | 14,391 |  |  | $ | 9,058 |
Weighted average years remaining vesting period |  |  | 2.54 |  |  |  | 2.05 |
Total equity awards outstanding (1) |  |  | 1,823,417 |  |  |  | 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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