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STOCKHOLDERS' EQUITY - Activity of Equity Incentive Plans (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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)		$ 24.98	$ 24.96	$ 23.83
Value of stock vested during the year (based on grant price)		$ 3,589,000	$ 2,365,000	$ 2,289,000
Weighted average per share value of shares forfeited during the year (based on grant price) (in dollars per share)		$ 24.03	$ 25.40	$ 23.59
Total charge to operations:
Total charge to operations		$ 4,686,000	$ 3,870,000	$ 3,510,000
Restricted stock
Summary of the activity of the incentive plans
Average per share grant price (in dollars per share)		$ 28.10	$ 25.70	$ 25.31
Deferred compensation to be recognized over vesting period		$ 4,202,000	$ 3,856,000	$ 3,664,000
Number of non-vested shares:
Non-vested beginning of period (in shares)	674,250	674,250	651,250	612,900
Number of shares awarded		149,550	150,050	144,750
Vested during year (in shares)		(122,125)	(114,650)	(106,000)
Forfeitures (in shares)			(12,400)	(400)
Non-vested end of period (in shares)		701,675	674,250	651,250	612,900
Total charge to operations:
Total charge to operations		$ 3,529,000	$ 3,229,000	$ 3,028,000
Total compensation costs related to non-vested awards that have not yet been recognized		$ 7,814,000
Weighted average 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)		$ 17.31	$ 28.96	$ 26.41
Deferred compensation to be recognized over vesting period		$ 850,000	$ 865,000	$ 952,000
Number of non-vested shares:
Non-vested beginning of period (in shares)	225,026	225,026	152,500	76,250
Number of shares awarded		75,026	77,776	76,250
Vested during year (in shares)		(24,343)
Forfeitures (in shares)		(51,907)	(5,250)
Non-vested end of period (in shares)		223,802	225,026	152,500	76,250
Total charge to operations:
Total charge to operations		$ 1,157,000	$ 641,000	$ 482,000
Total compensation costs related to non-vested awards that have not yet been recognized		$ 1,449,000
Weighted average vesting period		1 year 6 months
ROC Awards
Number of non-vested shares:
Vested during year (in shares)		0
Forfeitures (in shares)		0	(5,250)
Total charge to operations:
Weighted average vesting period		3 years
2016 and 2012 Incentive Plans | Restricted stock and RSU grants
Number of non-vested shares:
Non-vested end of period (in shares)		625,875
2016 and 2012 Incentive Plans | Restricted stock
Number of non-vested shares:
Non-vested end of period (in shares)		552,125
2016 and 2012 Incentive Plans | RSUs
Number of non-vested shares:
Non-vested end of period (in shares)		73,750
2016 and 2012 Incentive Plans | RSUs | Awards granted in 2017
Number of non-vested shares:
Number of shares awarded					76,250
Vested during year (in shares)	(24,343)
Forfeitures (in shares)	(51,907)
2019 Incentive Plan | Restricted stock and RSU grants
Number of non-vested shares:
Number of shares awarded		299,602
2019 Incentive Plan | Restricted stock
Number of non-vested shares:
Number of shares awarded		149,550
2019 Incentive Plan | RSUs
Number of non-vested shares:
Number of shares awarded		150,052

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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