ACCOUNTING POLICIES (Details 5) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings per share
Consolidated net income	$ 3,095	$ (3,098)	$ (904)	$ 13,429	$ 110	$ (2,071)	$ 1,668	$ 2,739	$ 12,522	$ 2,446	$ 8,854
Net income per common share—basic:
Net income attributable to common shares-basic (in dollars per share)	$ 0.12	$ (0.12)	$ (0.04)	$ 0.53	$ 0.00	$ (0.08)	$ 0.07	$ 0.11	$ 0.49	$ 0.10	$ 0.37
Weighted average common shares outstanding—basic	25,391	25,356	25,341	25,280	25,234	24,681	24,306	24,213	25,342	24,612	23,999
Effect of dilutive securities:
Stock options and restricted stock awards (in shares)									84	91	318
Weighted average common shares outstanding—diluted	25,540	25,356	25,341	25,290	25,266	24,681	24,398	24,390	25,426	24,703	24,317
Net income attributable to common shares-diluted (in dollars per share)	$ 0.12	$ (0.12)	$ (0.04)	$ 0.53	$ 0.00	$ (0.08)	$ 0.07	$ 0.11	$ 0.49	$ 0.10	$ 0.36
Stock options and restricted stock awards
Anti-dilutive securities excluded from computation of earnings per share
Stock options and restricted stock units (in shares)									466	323	291