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STOCKHOLDERS' EQUITY (Tables) | 6 Months Ended
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Jun. 30, 2021
STOCKHOLDERS' EQUITY |
Schedule of equity incentive plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, | ​ | June 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Restricted stock grants: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Number of shares | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 151,500 | ​ | ​ | 149,550
Average per share grant price | ​ | $ | — | ​ | $ | — | ​ | $ | 20.34 | ​ | $ | 28.10
Deferred compensation to be recognized over vesting period | ​ | $ | — | ​ | $ | — | ​ | $ | 3,082,000 | ​ | $ | 4,202,000
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Number of non-vested shares: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-vested beginning of period | ​ | ​ | 723,050 | ​ | ​ | 701,675 | ​ | ​ | 701,675 | ​ | ​ | 674,250
Grants | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 151,500 | ​ | ​ | 149,550
Vested during period | ​ | ​ | (15,800) | ​ | ​ | — | ​ | ​ | (145,725) | ​ | ​ | (122,125)
Forfeitures | ​ | ​ | (200) | ​ | ​ | — | ​ | ​ | (400) | ​ | ​ | —
Non-vested end of period | ​ | ​ | 707,050 | ​ | ​ | 701,675 | ​ | ​ | 707,050 | ​ | ​ | 701,675
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
RSU grants: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Number of underlying shares | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Average per share grant price | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Deferred compensation to be recognized over vesting period | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Number of non-vested shares: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-vested beginning of period | ​ | ​ | 223,802 | ​ | ​ | 225,026 | ​ | ​ | 223,802 | ​ | ​ | 225,026
Grants | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Vested during period | ​ | ​ | (73,750) | ​ | ​ | (24,343) | ​ | ​ | (73,750) | ​ | ​ | (24,343)
Forfeitures | ​ | ​ | — | ​ | ​ | (51,907) | ​ | ​ | — | ​ | ​ | (51,907)
Non-vested end of period | ​ | ​ | 150,052 | ​ | ​ | 148,776 | ​ | ​ | 150,052 | ​ | ​ | 148,776
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Restricted stock and RSU grants (based on grant price): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average per share value of non-vested shares | ​ | $ | 24.53 | ​ | $ | 25.65 | ​ | $ | 24.53 | ​ | $ | 25.65
Value of stock vested during the period | ​ | $ | 2,340,000 | ​ | $ | 585,000 | ​ | $ | 5,165,000 | ​ | $ | 3,589,000
Weighted average per share value of shares forfeited during the period | ​ | $ | 24.86 | ​ | $ | 24.03 | ​ | $ | 24.24 | ​ | $ | 24.03
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total charge to operations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding restricted stock grants | ​ | $ | 1,092,000 | ​ | $ | 884,000 | ​ | $ | 1,989,000 | ​ | $ | 1,759,000
Outstanding RSUs | ​ | ​ | 593,000 | ​ | ​ | 445,000 | ​ | ​ | 1,039,000 | ​ | ​ | 546,000
Total charge to operations | ​ | $ | 1,685,000 | ​ | $ | 1,329,000 | ​ | $ | 3,028,000 | ​ | $ | 2,305,000

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration