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STOCKHOLDERS' EQUITY (Tables)

12 Months Ended

Dec. 31, 2017

STOCKHOLDERS' EQUITY

Summary of the activity of the equity incentive plans

        The following is a summary of the activity of the equity incentive plans:

		Years Ended December 31,
		2017			2016			2015
Restricted stock:
Number of shares			140,100			139,225			129,975
Average per share grant price		$	24.75		$	21.74		$	24.60
Deferred compensation to be recognized over vesting period		$	3,467,000		$	3,027,000		$	3,197,000
Number of non-vested shares:
Non-vested beginning of year			591,750			538,755			480,995
Grants			140,100			139,225			129,975
Vested during year			(118,450	)		(85,730	)		(72,215	)
Forfeitures			(500	)		(500	)		—
​	​	​	​	​	​	​	​	​	​	​
Non-vested end of year			612,900			591,750			538,755
​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​	​	​
RSU grants:
Number of underlying shares			76,250			—			—
Average per share grant price		$	24.03			—			—
Deferred compensation to be recognized over vesting period		$	1,004,000			—			—
Number of non-vested shares:
Non-vested beginning of year			200,000			200,000			200,000
Grants			76,250			—			—
Vested during year			(113,584	)		—			—
Forfeitures			(86,416	)		—			—
​	​	​	​	​	​	​	​	​	​	​
Non-vested end of year			76,250			200,000			200,000
​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​	​	​
Restricted stock and RSU grants:
Weighted average per share value of non-vested shares (based on grant price)		$	22.89		$	17.95		$	17.12
​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​	​	​
Value of stock vested during the year (based on grant price)		$	3,008,000		$	1,451,500		$	612,000
​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​	​	​
Weighted average per share value of shares forfeited during the year (based on grant price)		$	8.37		$	21.05		$	—
​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​	​	​
Total charge to operations:
Outstanding restricted stock grants		$	2,966,000		$	2,692,000		$	2,204,000
Outstanding RSUs			167,000			291,000			130,000
​	​	​	​	​	​	​	​	​	​	​
Total charge to operations		$	3,133,000		$	2,983,000		$	2,334,000
​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​	​	​

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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.

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