SIGNIFICANT ACCOUNTING POLICIES - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net income (loss) as reported	$ 4,155	$ 15,170
Less: Distributed net income available to participating securities	(30)	(6)
Less: Undistributed net income available to participating securities	(37)	(312)
Numerator for basic net income per share	4,088	14,852
Add: Undistributed net income allocated to participating securities	37	312
Less: Undistributed net income reallocated to participating securities	(37)	(311)
Numerator for diluted net income per share	$ 4,088	$ 14,853
Denominator:
Weighted average shares outstanding for basic net income per share (in shares)	14,697,164	14,606,052
Effect of dilutive securities (in shares)	20,672	65,637
Weighted average shares outstanding for diluted net income per share (in shares)	14,717,836	14,671,689
Net income (loss) allocated to common stock for EPS calculation:
Basic (in dollars per share)	$ 0.28	$ 1.02
Diluted (in dollars per share)	$ 0.28	$ 1.01