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SIGNIFICANT ACCOUNTING POLICIES - Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Numerator:        
Net income (loss) as reported $ 17,244 $ 6,372 $ 32,414 $ 10,292
Less: Distributed net income available to participating securities (2) (7) (5) (14)
Less: Undistributed net income available to participating securities (136) (141) (256) (225)
Numerator for basic net income per share 17,106 6,224 32,153 10,053
Add: Undistributed net income allocated to participating securities 136 141 256 225
Less: Undistributed net income reallocated to participating securities (134) (141) (252) (225)
Numerator for diluted net income per share $ 17,108 $ 6,224 $ 32,157 $ 10,053
Denominator:        
Weighted average shares outstanding for basic net income per share (in shares) 14,647,019 14,534,016 14,624,718 14,491,569
Effect of dilutive securities (in shares) 252,968 0 225,098 0
Weighted average shares outstanding for diluted net income per share (in shares) 14,899,987 14,534,016 14,849,816 14,491,569
Net income (loss) allocated to common stock for EPS calculation:        
Basic (in dollars per share) $ 1.17 $ 0.43 $ 2.20 $ 0.69
Diluted (in dollars per share) $ 1.15 $ 0.43 $ 2.17 $ 0.69