EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income (loss)	$ 34,136	$ (972)	$ 15,439
Basic:
Weighted average shares outstanding (in shares)	37,043	36,677	28,839
Weighted average shares outstanding (in dollars per share)	$ 0.92	$ (0.03)	$ 0.54
Diluted:
Effect of dilutive securities - options (in shares)	254	0	257
Total weighted average shares outstanding (in shares)	37,297	36,677	29,096
Total weighted average shares outstanding (in dollars per share)	$ 0.92	$ (0.03)	$ 0.53