SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 15,994	$ 15,027	$ 44,933	$ 46,946
Net income allocated to unvested restricted stock	(125)	(119)	(361)	(404)
Net income allocated to common shares	$ 15,869	$ 14,908	$ 44,572	$ 46,542
Weighted average shares outstanding:
Basic	29,208	29,799	29,466	29,685
Effect of dilutive securities	365	500	331	479
Diluted	29,573	30,299	29,797	30,164
Basic income per common share	$ 0.54	$ 0.50	$ 1.51	$ 1.57
Diluted income per common share	$ 0.54	$ 0.49	$ 1.50	$ 1.54