EARNINGS PER COMMON SHARE - Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 9,362	$ 7,212
Basic:
Weighted average shares outstanding (in shares)	37,413	36,990
Weighted average shares outstanding (in dollars per share)	$ 0.25	$ 0.19
Diluted:
Effect of dilutive securities - options (in shares)	173	248
Weighted average shares outstanding, Total (in shares)	37,586	37,238
Weighted average shares outstanding, Total (in dollars per share)	$ 0.25	$ 0.19