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STOCKHOLDERS' EQUITY - Activity of Equity Incentive Plans (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2010
Restricted stock and RSU grants
Restricted stock and RSU grants:
Weighted average per share value of non-vested shares (based on grant price) (in dollars per share)		$ 24.96	$ 23.83	$ 22.89
Value of stock vested during the year (based on grant price)		$ 2,365,000	$ 2,289,000	$ 3,008,000
Weighted average per share value of shares forfeited during the year (based on grant price) (in dollars per share)		$ 25.40	$ 23.59	$ 8.37
Total charge to operations:
Share based compensation charged to operations		$ 3,870,000	$ 3,510,000	$ 3,133,000
Restricted stock
Summary of the activity of the incentive plans
Average per share grant price (in dollars per share)		$ 25.70	$ 25.31	$ 24.75
Deferred compensation to be recognized over vesting period		$ 3,856,000	$ 3,664,000	$ 3,467,000
Number of non-vested shares:
Non-vested beginning of period (in shares)		651,250	612,900	591,750
Number of shares awarded		150,050	144,750	140,100
Vested during year (in shares)		(114,650)	(106,000)	(118,450)
Forfeitures (in shares)		(12,400)	(400)	(500)
Non-vested end of period (in shares)		674,250	651,250	612,900
Total charge to operations:
Share based compensation charged to operations		$ 3,229,000	$ 3,028,000	$ 2,966,000
Total compensation costs related to non-vested awards that have not yet been recognized		$ 7,140,000
Weighted average remaining vesting period		2 years 1 month 6 days
RSUs
Summary of the activity of the incentive plans
Average per share grant price (in dollars per share)		$ 28.96	$ 26.41	$ 24.03
Deferred compensation to be recognized over vesting period		$ 865,000	$ 952,000	$ 1,004,000
Number of non-vested shares:
Non-vested beginning of period (in shares)		152,500	76,250	200,000
Number of shares awarded		77,776	76,250	76,250
Vested during year (in shares)				(113,584)
Forfeitures (in shares)		(5,250)		(86,416)
Non-vested end of period (in shares)		225,026	152,500	76,250
Total charge to operations:
Share based compensation charged to operations		$ 641,000	$ 482,000	$ 167,000
Total compensation costs related to non-vested awards that have not yet been recognized		$ 1,277,000
Weighted average remaining vesting period		1 year 6 months
2016 and 2012 Incentive Plans | Restricted stock and RSU grants
Number of non-vested shares:
Non-vested end of period (in shares)		824,250
2016 and 2012 Incentive Plans | Restricted stock
Number of non-vested shares:
Non-vested end of period (in shares)		674,250
2016 and 2012 Incentive Plans | RSUs
Number of non-vested shares:
Non-vested end of period (in shares)		150,000
2019 Incentive Plan | RSUs
Number of non-vested shares:
Number of shares awarded		75,026
2009 Incentive Plan | RSUs
Number of non-vested shares:
Number of shares awarded					200,000
Vested during year (in shares)	(113,584)			(113,584)
Forfeitures (in shares)				(86,416)

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