EARNINGS PER COMMON SHARE - Summary of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income attributable to common shareholders	$ 2,986	$ 5,471	$ 14,428	$ 17,080
Basic:
Weighted average common shares outstanding (in shares)	13,165	12,882	13,104	12,860
Weighted average common shares outstanding (in dollars per share)	$ 0.23	$ 0.42	$ 1.10	$ 1.33
Diluted:
Dilutive effect of stock option exercises (in shares)	319	226	341	178
Total (in shares)	13,483	13,108	13,445	13,038
Total (in dollars per share)	$ 0.22	$ 0.42	$ 1.07	$ 1.31