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SIGNIFICANT ACCOUNTING POLICIES - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income (loss) as reported	$ 6,915	$ 4,910	$ 39,329	$ 15,202
Less: Distributed net income available to participating securities	(14)	(7)	(19)	(20)
Less: Undistributed net income available to participating securities	(39)	(104)	(287)	(323)
Numerator for basic net income per share	6,862	4,799	39,023	14,859
Add: Undistributed net income allocated to participating securities	39	104	287	323
Less: Undistributed net income reallocated to participating securities	(39)	(104)	(283)	(323)
Numerator for diluted net income per share	$ 6,862	$ 4,799	$ 39,027	$ 14,859
Denominator:
Weighted average shares outstanding for basic net income per share (in shares)	14,632,276	14,571,155	14,589,655	14,518,765
Effect of dilutive securities (in shares)	218,890	0	210,477	0
Weighted average shares outstanding for diluted net income per share (in shares)	14,851,166	14,571,155	14,800,132	14,518,765
Net income (loss) allocated to common stock for EPS calculation:
Basic (in dollars per share)	$ 0.47	$ 0.33	$ 2.67	$ 1.02
Diluted (in dollars per share)	$ 0.46	$ 0.33	$ 2.64	$ 1.02

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