DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net income/(loss), Basic	$ (4,835)	$ 3,895	$ 6,585	$ 449	$ 5,430	$ 5,037	$ 2,777	$ 2,250	$ 6,094	$ 15,494	$ (1,076)
Net income/(loss) allocated to common shares, Basic									$ 5,997	$ 15,340	$ (1,076)
Earnings/(Loss) per share, Basic	$ (0.41)	$ 0.32	$ 0.55	$ 0.04	$ 0.46	$ 0.43	$ 0.24	$ 0.19	$ 0.51	$ 1.31	$ (0.09)
Net income/(loss), Diluted	$ (4,835)	$ 3,895	$ 6,585	$ 449	$ 5,430	$ 5,037	$ 2,777	$ 2,250	$ 6,094	$ 15,494	$ (1,076)
Net income/(loss) allocated to common shares, Diluted									$ 5,997	$ 15,340	$ (1,076)
Basic Weighted-Average Shares Outstanding									11,841	11,677	11,547
Diluted Weighted-Average Shares Outstanding									12,040	11,772	11,547
(Loss)/Earnings per share, Diluted	$ (0.41)	$ 0.32	$ 0.53	$ 0.04	$ 0.46	$ 0.42	$ 0.23	$ 0.19	$ 0.50	$ 1.30	$ (0.09)
Convertible Senior Notes [Member]
Dilutive effect of Notes, Diluted									96	0	0
Equity Option [Member]
Dilutive effect of Notes, Diluted									103	95	0
Restricted Stock [Member]
Net income allocated to restricted stock, Basic									$ (97)	$ (154)	$ 0
Net income allocated to restricted stock, Diluted									$ (97)	$ (154)	$ 0