NET INCOME PER SHARE - Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Basic net income per share:
Net income	$ 11,376	$ 10,835	$ 22,368	$ 17,230
Weighted average common shares outstanding - Basic (in shares)	82,423	76,213	80,491	75,487
Basic net income per common share (in dollars per share)	$ 0.14	$ 0.14	$ 0.28	$ 0.23
Diluted net income per share:
Net income	$ 11,376	$ 10,835	$ 22,368	$ 17,230
Weighted average common shares outstanding - Basic (in shares)	82,423	76,213	80,491	75,487
Effect of dilutive securities:
Warrants (in shares)	0	1,589	0	1,864
Stock options and restricted stock (in shares)	1,090	1,161	1,211	1,352
Weighted average common shares for diluted earnings per share (in shares)	83,513	78,963	81,702	78,703
Diluted net income per common share (in dollars per share)	$ 0.14	$ 0.14	$ 0.27	$ 0.22