EARNINGS (LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended								11 Months Ended	12 Months Ended
	Jan. 31, 2017	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, 2017	Dec. 31, 2019	Dec. 31, 2018
(Loss) earnings per share:
Net (income) loss for basic and diluted income (loss) per common share	$ (3,318)	$ 5,341	$ 4,038	$ 7,074	$ 3,156	$ 4,865	$ (13,413)	$ 1,844	$ (540)	$ (10,174)	$ 19,609	$ (7,244)
Shares:
Weighted-average common shares outstanding - basic (in shares)		38,014,444	37,984,316	37,505,598	36,182,783	36,182,783	30,975,338	17,227,682	17,227,682	17,227,682	37,428,345	25,484,386
Weighted-average common shares outstanding - diluted (in shares)		38,274,079	38,286,702	37,594,151	36,195,463	36,572,071	30,975,338	17,227,682	17,227,682	17,227,682	37,594,158	25,484,386
Earnings (loss) per common share - basic and diluted (in dollars per share)		$ 0.14	$ 0.11	$ 0.19	$ 0.09	$ 0.13	$ (0.43)	$ 0.11	$ (0.03)	$ (0.59)	$ 0.52	$ (0.28)
RSUs
Shares:
Effect of dilutive securities (in shares)										0	12,416	0
Securities excluded from computation of diluted loss per share (in shares)											19,000.0	21,200
Stock options
Shares:
Effect of dilutive securities (in shares)										0	140,640	0
Securities excluded from computation of diluted loss per share (in shares)										0	500,000	2,900,000
Warrants
Shares:
Effect of dilutive securities (in shares)										0	12,757	0
Securities excluded from computation of diluted loss per share (in shares)										0		9,000,000.0