EARNINGS PER SHARE (Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic, numerator:
Net income	$ 24,376	$ 4,888	$ 1,233	$ 9,954	$ 29,264	$ 11,187
Effect of unvested restricted stock unit awards	(11)		(4)		(26)	(31)
Adjusted net income	$ 24,365		$ 1,229		$ 29,238	$ 11,156
Basic, denominator:
Weighted-average shares	25,554,286		25,670,325		25,562,306	25,656,674
Earnings per common share (in dollars per share)	$ 0.95		$ 0.05		$ 1.14	$ 0.43
Diluted, numerator:
Net income	$ 24,376	$ 4,888	$ 1,233	$ 9,954	$ 29,264	$ 11,187
Effect of unvested restricted stock unit awards	(11)		(4)		(25)	(30)
Adjusted net income	$ 24,365		$ 1,229		$ 29,239	$ 11,157
Diluted, denominator:
Weighted-average shares	25,554,286		25,670,325		25,562,306	25,656,674
Effect of dilutive securities	877,306		1,029,224		920,705	996,608
Adjusted weighted-average shares and assumed conversions	26,431,592		26,699,549		26,483,011	26,653,282
Earnings per common share (in dollars per share)	$ 0.92		$ 0.05		$ 1.10	$ 0.42