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Stock Based and Deferred Compensation (Tables) | 9 Months Ended
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Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of compensation expense and stock award activity | Below is a summary of compensation expense and stock award activity (dollars in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Stock-based compensation expense | $ | 3,953 |  |  | $ | 3,771 |  |  | $ | 12,418 |  |  | $ | 9,035 |
Non-vested shares granted | 20,600 |  |  | — |  |  | 424,387 |  |  | 374,683 |
Performance-based non-vested shares granted | — |  |  | — |  |  | 66,187 |  |  | 52,083 |
Stock options exercised | 3,000 |  |  | 1,200 |  |  | 146,640 |  |  | 41,445 |
Restricted stock awards vested (includes performance-based awards) | 1,800 |  |  | 2,100 |  |  | 372,004 |  |  | 309,490 |
Summary of stock based compensation agreements | The following table includes additional information regarding our Plan (dollars in thousands):
|  | As of
|  | September 30, 2015 |  | December 31, 2014
Unrecognized stock-based compensation cost |  | $ | 21,756 |  |  | $ | 20,577 |
Weighted average years expense recognition period |  | 2.40 |  |  | 2.11 |
Total equity awards outstanding (1) |  | 1,085,944 |  |  | 1,255,714 |
(1) | Includes options outstanding and unvested restricted stock and performance-based awards and restricted stock units.

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- Definition Schedule of Stock-based Compensation Expense and Cash Proceeds Received from Share-based Payment Awards [Table Text Block] + References No definition available. + 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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