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STOCK BASED AND DEFERRED COMPENSATION (Tables) | 3 Months Ended
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Mar. 31, 2018
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 March 31,
| 2018 |  | 2017
Stock-based compensation expense | $ | 5,209 |  |  | $ | 3,295 |
Non-vested shares granted | 306,164 |  |  | 416,500 |
Performance-based non-vested shares granted | 157,637 |  |  | 154,120 |
Restricted stock awards vested (includes performance-based awards) | 301,575 |  |  | 283,574 |
Summary of Additional Information Regarding Stock Plan | The following table includes additional information regarding our Plan (dollars in thousands):
|  | As of
|  | March 31, 2018 |  | December 31, 2017
Unrecognized stock-based compensation cost |  | $ | 26,696 |  |  | $ | 18,439 |
Weighted average years expense recognition period |  | 2.97 |  |  | 2.48 |
Total equity awards outstanding (1) |  | 1,377,061 |  |  | 1,269,657 |
(1) | Includes unvested restricted stock, performance-based awards (at target level) 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=96867065&loc=d3e5070-113901 + Details
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