EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Basic and Diluted Earnings per Share [Line Items]
Net income from continuing operations	$ (29,336)	$ 11,070	$ 157	$ 20,364	$ 45,259	$ (19,082)	$ 109	$ 18,584	$ 2,255	$ 44,870	$ 49,118
Weighted-average common shares outstanding (in shares)									25,006,211	25,103,720	25,335,706
Weighted-average common shares, diluted (in shares)									25,622,812	25,640,604	25,804,678
Earnings per common share from continuing operations, basic (in dollars per share)	$ (1.17)	$ 0.44	$ 0.01	$ 0.82	$ 1.81	$ (0.77)	$ 0	$ 0.73	$ 0.09	$ 1.79	$ 1.94
Earnings per common share from continuing operations, diluted (in dollars per share)	(1.17)	0.43	0.01	0.80	1.78	(0.77)	0	0.72	0.09	1.75	1.90
Earnings per common share from discontinued operations, basic (in dollars per share)	0	0	0	(0.08)	0.03	0.05	0.11	0.05	(0.08)	0.24	0.03
Earnings per common share from discontinued operations, diluted (in dollars per share)	$ 0	$ 0	$ 0	$ (0.07)	$ 0.03	$ 0.05	$ 0.11	$ 0.05	(0.07)	0.24	0.03
Gain on sale of discontinued operations, basic (in dollars per share)									1.10	0	0
Gain on sale of discontinued operations, diluted (in dollar per share)									1.07	0	0
Earnings per common share, basic (in dollars per share)									1.11	2.03	1.97
Earnings per common share, diluted (in dollars per share)									$ 1.08	$ 1.99	$ 1.93
Awards excluded from diluted calculation (in shares)									2,681	0	0
Restricted Stock Awards
Basic and Diluted Earnings per Share [Line Items]
Add dilutive effect of restricted stock awards (in shares)									273,544	250,530	155,059
Stock Options
Basic and Diluted Earnings per Share [Line Items]
Add dilutive effect of restricted stock awards (in shares)									343,057	286,354	313,913