EARNINGS PER SHARE (EPS) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
EARNINGS PER SHARE (EPS) [Abstract]
Net income	$ 10,081	$ 11,765	$ 33,388	$ 32,259
Less: Dividends paid on earnings allocated to participating securities	(31)	(41)	(105)	(128)
Income attributable to common stock	$ 10,050	$ 11,724	$ 33,283	$ 32,131
Weighted Average Number Of Shares Outstanding Including Participating Securities Basic (in shares)	36,552,925	36,215,186	36,414,645	36,164,129
Less: weighted average participating securities (in shares)	(224,102)	(295,044)	(252,162)	(305,615)
Weighted average shares outstanding utilized in the calculation of basic EPS (in shares)	36,328,823	35,920,142	36,162,483	35,858,514
Earnings Per Share, Basic (in dollars per share)	$ 0.28	$ 0.33	$ 0.92	$ 0.90
Income attributable to common stock	$ 10,050	$ 11,724	$ 33,283	$ 32,131
Weighted average common shares outstanding	36,328,823	35,920,142	36,162,483	35,858,514
Common stock equivalents resulting from the dilutive effect of "in-the-money" stock options	92,631	54,197	87,887	82,231
Weighted average shares outstanding utilized in the calculation of diluted EPS (in shares)	36,421,454	35,974,339	36,250,370	35,940,745
Earnings Per Share, Diluted (in dollars per share)	$ 0.28	$ 0.33	$ 0.92	$ 0.90
Weighted average shares excluded from earnings per share calculation (in shares)	80,000	270,996	132,976	309,444