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STOCKHOLDERS' EQUITY - Activity of Equity Incentive Plans (Details) - USD ($)	3 Months Ended		9 Months Ended			12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
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)	$ 25.04	$ 24.98	$ 25.04	$ 24.98
Value of stock vested during the year (based on grant price)			$ 5,165,000	$ 3,589,000
Weighted average per share value of shares forfeited during the year (based on grant price) (in dollars per share)	$ 24.84		$ 24.57	$ 24.03
Total charge to operations:
Total charge to operations	$ 1,163,000	$ 1,136,000	$ 4,191,000	$ 3,441,000
Restricted stock grants
Summary of the activity of the incentive plans
Average per share grant price (in dollars per share)			$ 20.34	$ 28.10
Deferred compensation to be recognized over vesting period	$ 3,082,000	$ 4,202,000	$ 3,082,000	$ 4,202,000
Number of non-vested shares:
Non-vested beginning of period (in shares)	707,050	701,675	701,675	674,250
Number of shares awarded			151,500	149,550
Vested during period (in shares)			(145,725)	(122,125)
Forfeitures (in shares)	(500)		(900)
Non-vested end of period (in shares)	706,550	701,675	706,550	701,675		674,250
Total charge to operations:
Total charge to operations	$ 871,000	$ 885,000	$ 2,859,000	$ 2,644,000
Total compensation costs related to non-vested awards that have not yet been recognized	$ 8,014,000		$ 8,014,000
Weighted average vesting period			2 years 3 months 18 days
Restricted stock units
Summary of the activity of the incentive plans
Average per share grant price (in dollars per share)	$ 30.46	$ 17.31	$ 30.46	$ 17.31
Deferred compensation to be recognized over vesting period	$ 1,647,000	$ 861,000	$ 1,647,000	$ 861,000
Number of non-vested shares:
Non-vested beginning of period (in shares)	150,052	148,776	223,802	225,026
Number of shares awarded	80,700	75,026	80,700	75,026
Vested during period (in shares)			(73,750)	(24,343)
Forfeitures (in shares)				(51,907)		(2,750)
Non-vested end of period (in shares)	230,752	223,802	230,752	223,802		225,026
Total charge to operations:
Total charge to operations	$ 292,000	$ 251,000	$ 1,332,000	$ 797,000
Total compensation costs related to non-vested awards that have not yet been recognized	$ 2,499,000		$ 2,499,000
Weighted average vesting period			1 year 9 months 18 days
2019 Incentive Plan | Restricted stock and RSU grants
Number of non-vested shares:
Non-vested end of period (in shares)	524,952		524,952
2019 Incentive Plan | Restricted stock grants
Number of non-vested shares:
Non-vested end of period (in shares)	294,200		294,200
2019 Incentive Plan | Restricted stock units
Number of non-vested shares:
Non-vested end of period (in shares)	230,752		230,752
2016 Incentive Plan | Restricted stock grants
Number of non-vested shares:
Non-vested end of period (in shares)	412,350		412,350
2016 Incentive Plan | Restricted stock units
Number of non-vested shares:
Vested during period (in shares)			(73,750)	(24,343)
Forfeitures (in shares)				(51,907)	(2,500)
Pay-for-performance program | Restricted stock units
Number of non-vested shares:
Vested during period (in shares)	0		0
Forfeitures (in shares)	0		0

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