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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
SHARE-BASED COMPENSATION
Net income	$ 6,859	$ 9,917	$ 8,326	$ 14,554	$ 13,534	$ 16,037	$ 25,102	$ 44,125
Weighted average shares outstanding - basic	28,060,020			28,424,898			28,075,684	28,575,369
Weighted average shares outstanding - diluted	28,111,664			28,602,338			28,172,153	28,762,057
Basic earnings per common share (in dollars per share)	$ 0.24			$ 0.51			$ 0.89	$ 1.54
Diluted earnings per common share (in dollars per share)	$ 0.24			$ 0.51			$ 0.89	$ 1.53
Antidilutive securities excluded from the dilutive share calculation (in shares)	0			0			0	0
Stock Option
SHARE-BASED COMPENSATION
Dilutive effect of share-based compensation arrangements	51,644			177,440			96,469	186,688

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