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STOCK-BASED COMPENSATION - 2015 EIP Restricted Stock Units (Details) - 2015 EIP Plan - Restricted Stock Units - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 15, 2020 | Feb. 25, 2020 | May 15, 2019 | Mar. 04, 2019 | May 15, 2018 | Feb. 27, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock Awards |  |  |  |  |  |  |  |  |
Number of common shares outstanding in respect of RSUs |  |  |  |  |  |  | 373,588 | 326,247 |
Vesting period of awards |  |  |  |  |  |  | 3 years |  |
Number of Shares |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in shares) |  |  |  |  |  |  | 162,096 | 149,170 | 220,129
Granted (in shares) | 42,642 | 173,749 | 29,580 | 106,079 | 14,268 | 37,436 | 221,903 | 140,914 | 51,704
Vested (in shares) | (29,580) |  | (14,268) |  |  |  | (83,675) | (127,988) | (122,663)
Forfeited (in shares) |  |  |  |  |  |  | (1,490) |  |
Balance at the end of the period (in shares) |  |  |  |  |  |  | 298,834 | 162,096 | 149,170
Weighted Average Fair Value |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in dollars per share) |  |  |  |  |  |  | $ 9.26 | $ 12.42 | $ 11.01
Granted (in dollars per share) |  |  |  |  |  |  | 6.80 | 8.50 | 14.84
Vested (in dollars per share) |  |  |  |  |  |  | 9.07 | 12.10 | 10.92
Forfeited (in dollars per share) |  |  |  |  |  |  | 8.39 |  |
Balance at the end of the period (in dollars per share) |  |  |  |  |  |  | $ 7.49 | $ 9.26 | $ 12.42
Weighted-average remaining contractual life |  |  |  |  |  |  | 1 year 7 months 2 days |  |
Additional disclosures |  |  |  |  |  |  |  |  |
Total fair value of shares vested |  |  |  |  |  |  | $ 550 | $ 1,235 | $ 1,694
Unrecognized compensation cost related to nonvested stock awards |  |  |  |  |  |  |  |  |
Unrecognized compensation cost |  |  |  |  |  |  | $ 849 |  |
Weighted-average period for recognition of unrecognized compensation cost |  |  |  |  |  |  | 1 year 7 months 2 days |  |
General and Administrative Expense |  |  |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |
Recognized nonvested stock amortization expense |  |  |  |  |  |  | $ 1,239 | $ 1,207 | $ 1,489
Vested RSUs |  |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |  |
Number of shares vested |  |  |  |  |  |  | 505,898 |  |
Weighted Average Grant Date Price, Vested |  |  |  |  |  |  | $ 11.07 |  |

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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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