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STOCK BASED AND DEFERRED COMPENSATION (Tables) | 6 Months Ended
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Jun. 30, 2019
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 June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Stock-based compensation expense | $ | 4,201 |  |  | $ | 3,767 |  |  | $ | 10,062 |  |  | $ | 8,976 |
Non-vested shares granted | 4,500 |  |  | — |  |  | 382,014 |  |  | 306,164 |
Performance-based non-vested shares granted | — |  |  | — |  |  | 94,152 |  |  | 157,637 |
Restricted stock awards vested (includes performance-based awards) | 2,600 |  |  | 17,137 |  |  | 402,923 |  |  | 318,712 |
Summary of Additional Information Regarding Stock Plan | The following table includes additional information regarding our Stock Plans (dollars in thousands):
|  | As of
|  | June 30, 2019 |  | December 31, 2018
Unrecognized stock-based compensation cost |  | $ | 26,182 |  |  | $ | 24,954 |
Weighted average years expense recognition period |  | 2.67 |  |  | 2.24 |
Total equity awards outstanding (1) |  | 1,310,653 |  |  | 1,301,745 |
(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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