EARNINGS PER SHARE (Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Basic, numerator:
Net income (loss)	$ 9,954	$ (7,407)
Effect of unvested restricted stock unit awards	(30)	(17)
Adjusted net income (loss)	$ 9,924	$ (7,424)
Basic, denominator:
Weighted-average shares	25,642,871	25,684,475
Earnings (loss) per common share (in dollars per share)	$ 0.39	$ (0.29)
Diluted, numerator:
Net income (loss)	$ 9,954	$ (7,407)
Effect of unvested restricted stock unit awards	(29)	(17)
Adjusted net income (loss)	$ 9,925	$ (7,424)
Diluted, denominator:
Weighted-average shares	25,642,871	25,684,475
Effect of dilutive securities	953,505
Adjusted weighted-average shares and assumed conversions	26,596,376	25,684,475
Earnings (loss) per common share (in dollars per share)	$ 0.37	$ (0.29)