SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income	$ 10,926	$ 15,027	$ 24,435	$ 7,484	$ 8,850	$ 7,949	$ 16,118	$ 2,552	$ 57,872	$ 35,469	$ 26,143
Net income allocated to unvested restricted stock									(487)	(294)	(306)
Net income allocated to common shares									$ 57,385	$ 35,175	$ 25,837
Weighted average shares outstanding:
Basic									29,706	29,213	28,695
Effect of dilutive securities									485	332	480
Diluted									30,191	29,545	29,175
Basic income per common share	$ 0.36	$ 0.50	$ 0.82	$ 0.25	$ 0.30	$ 0.27	$ 0.55	$ 0.09	$ 1.93	$ 1.20	$ 0.90
Diluted income per common share	$ 0.36	$ 0.49	$ 0.80	$ 0.25	$ 0.29	$ 0.27	$ 0.54	$ 0.09	$ 1.90	$ 1.19	$ 0.89