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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of compensation expense and stock award activity |
| Three Months Ended March 31,
| 2014 |  | 2013
Stock-based compensation expense | $ | 2,411 |  |  | $ | 1,844 |
Non-vested shares granted | 355,283 |  |  | 332,100 |
Performance-based non-vested shares granted | 52,083 |  |  | 62,500 |
Stock options exercised | 40,245 |  |  | 122,273 |
Restricted stock awards vested (includes performance-based awards) | 300,170 |  |  | 274,600 |
Summary of stock based compensation agreements |
| As of
| March 31, 2014 |  | December 31, 2013
Unrecognized stock-based compensation cost | $ | 29,989 |  |  | $ | 17,385 |
Weighted average years remaining vesting period | 2.90 |  |  | 2.18 |
Total equity awards outstanding (1) | 1,357,101 |  |  | 1,317,710 |
(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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