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STOCKHOLDERS' EQUITY - Activity of Equity Incentive Plans (Details) - USD ($)	3 Months Ended		6 Months Ended			12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2020	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)	$ 24.53	$ 25.65	$ 24.53	$ 25.65
Value of stock vested during the year (based on grant price)	$ 2,340,000	$ 585,000	$ 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)	$ 24.86	$ 24.03	$ 24.24	$ 24.03
Total charge to operations:
Total charge to operations	$ 1,685,000	$ 1,329,000	$ 3,028,000	$ 2,305,000
Restricted stock
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)	723,050	701,675	701,675	674,250		674,250
Number of shares awarded			151,500	149,550
Vested during period (in shares)	(15,800)		(145,725)	(122,125)
Forfeitures (in shares)	(200)		(400)
Non-vested end of period (in shares)	707,050	701,675	707,050	701,675		701,675	674,250
Total charge to operations:
Total charge to operations	$ 1,092,000	$ 884,000	$ 1,989,000	$ 1,759,000
Total compensation costs related to non-vested awards that have not yet been recognized	$ 8,897,000		$ 8,897,000
Weighted average vesting period			2 years 7 months 6 days
RSUs
Number of non-vested shares:
Non-vested beginning of period (in shares)	223,802	225,026	223,802	225,026		225,026
Vested during period (in shares)	(73,750)	(24,343)	(73,750)	(24,343)
Forfeitures (in shares)		(51,907)		(51,907)			(2,750)
Non-vested end of period (in shares)	150,052	148,776	150,052	148,776		223,802	225,026
Total charge to operations:
Total charge to operations	$ 593,000	$ 445,000	$ 1,039,000	$ 546,000
Total compensation costs related to non-vested awards that have not yet been recognized	$ 1,145,000		$ 1,145,000
Weighted average vesting period			1 year 6 months
2019 Incentive Plan | Restricted stock and RSU grants
Number of non-vested shares:
Non-vested end of period (in shares)	444,452		444,452
2019 Incentive Plan | Restricted stock
Number of non-vested shares:
Non-vested end of period (in shares)	294,400		294,400
2019 Incentive Plan | RSUs
Number of non-vested shares:
Non-vested end of period (in shares)	150,052		150,052
2016 Incentive Plan | Restricted stock
Number of non-vested shares:
Non-vested end of period (in shares)	412,650		412,650
2016 Incentive Plan | RSUs
Number of non-vested shares:
Vested during period (in shares)			(73,750)	(24,343)
Forfeitures (in shares)				(51,907)	(2,500)
Non-vested end of period (in shares)	76,250		76,250
Pay-for-performance program | RSUs
Number of non-vested shares:
Vested during period (in shares)	0		0
Forfeitures (in shares)	0		0

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