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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
EARNINGS PER SHARE        
Net income for common shareholders $ 2,163 $ 14,315 $ 9,704 $ 24,805
Weighted-average shares (thousands)        
Basic weighted-average shares outstanding 24,752,000 24,921,000 24,839,000 24,916,000
Dilutive effect of outstanding stock options and unvested restricted stock awards 28,000 121,000 46,000 131,000
Diluted weighted-average shares outstanding 24,780,000 25,042,000 24,885,000 25,047,000
Earnings per share:        
Basic $ 0.09 $ 0.57 $ 0.39 $ 1.00
Diluted $ 0.09 $ 0.57 $ 0.39 $ 0.99
Excluded from diluted weighted-average share, number of stock options 80,000   80,000