CALCULATION OF WEIGHTED AVERAGE SHARES OUTSTANDING FOR EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Earnings Per Share [Abstract]
Net income	$ 13,249	$ 16,987	$ 25,383	$ 27,537	$ 54,070
Basic weighted average shares outstanding	20,726	19,342	20,246	19,344
Plus unvested restricted stock	64	68	55	62
Diluted weighted shares outstanding	20,790	19,410	20,301	19,406
Earnings per common share
Basic (in dollars per share)	$ 0.64	$ 0.88	$ 1.25	$ 1.42
Diluted (in dollars per share)	$ 0.64	$ 0.88	$ 1.25	$ 1.42