EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
EARNINGS PER SHARE
Net income for common shareholders	$ 7,541	$ 10,490
Weighted-average shares (thousands)
Basic weighted-average shares outstanding	24,926	24,910
Dilutive effect of outstanding stock options and unvested restricted stock awards	74	144
Diluted weighted-average shares outstanding	25,000	25,054
Earnings per share:
Basic	$ 0.30	$ 0.42
Diluted	$ 0.30	$ 0.42