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STOCK BASED AND DEFERRED COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Stock-based compensation expense | $ | 4,761 |  |  | $ | 4,113 |  |  | $ | 13,737 |  |  | $ | 9,898 |
Non-vested shares granted | 9,083 |  |  | 14,075 |  |  | 315,247 |  |  | 430,575 |
Performance-based non-vested shares granted | — |  |  | — |  |  | 157,637 |  |  | 154,120 |
Restricted stock awards vested (includes performance-based awards) | 2,710 |  |  | 5,780 |  |  | 321,422 |  |  | 295,544 |
Summary of Additional Information Regarding Stock Plan | The following table includes additional information regarding our Stock Plans (dollars in thousands):
|  | As of
|  | September 30, 2018 |  | December 31, 2017
Unrecognized stock-based compensation cost |  | $ | 22,742 |  |  | $ | 18,439 |
Weighted average years expense recognition period |  | 2.46 |  |  | 2.48 |
Total equity awards outstanding (1) |  | 1,308,289 |  |  | 1,269,657 |
(1) | Includes unvested restricted stock, performance-based awards (assuming 100% payout) 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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