EARNINGS PER SHARE (Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Basic, numerator:
Net income	$ 10,231	$ 19,967	$ 4,128	$ 20,712
Effect of unvested restricted stock unit awards	(81)	(207)	(38)	(231)
Adjusted net income	$ 10,150	$ 19,760	$ 4,090	$ 20,481
Basic, denominator:
Weighted-average shares	25,791,026	26,021,874	25,806,774	26,036,375
Earnings per common share (in dollars per share)	$ 0.39	$ 0.76	$ 0.16	$ 0.79
Diluted, numerator:
Net income	$ 10,231	$ 19,967	$ 4,128	$ 20,712
Effect of unvested restricted stock unit awards	(80)	(203)	(38)	(227)
Adjusted net income	$ 10,151	$ 19,764	$ 4,090	$ 20,485
Diluted, denominator:
Weighted-average shares	25,791,026	26,021,874	25,806,774	26,036,375
Effect of dilutive securities	455,842	571,577	488,909	556,240
Adjusted weighted-average shares and assumed conversions	26,246,868	26,593,451	26,295,683	26,592,615
Earnings per common share (in dollars per share)	$ 0.39	$ 0.74	$ 0.16	$ 0.77