EARNINGS PER SHARE (EPS) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
EARNINGS PER SHARE (EPS) [Abstract]
Net income	$ 10,460	$ 12,039	$ 20,494	$ 22,609
Less: Dividends paid on earnings allocated to participating securities	(42)	(45)	(86)	(91)
Income attributable to common stock	10,418	11,994	20,408	22,518
Weighted Average Number Of Shares Outstanding Including Participating Securities Basic (in shares)	36,181,381	35,295,926	36,138,178	35,222,298
Less: weighted average participating securities (in shares)	(304,243)	(320,852)	(310,989)	(322,855)
Weighted average shares outstanding utilized in the calculation of basic EPS (in shares)	35,877,138	34,975,074	35,827,189	34,899,443
Earnings Per Share, Basic (in dollars per share)	$ 0.29	$ 0.34	$ 0.57	$ 0.65
Income attributable to common stock	$ 10,418	$ 11,994	$ 20,408	$ 22,518
Weighted average common shares outstanding	35,877,138	34,975,074	35,827,189	34,899,443
Common stock equivalents resulting from the dilutive effect of "in-the-money" stock options	80,153	72,989	96,160	64,806
Weighted average shares outstanding utilized in the calculation of diluted EPS (in shares)	35,957,291	35,048,063	35,923,349	34,964,249
Earnings Per Share, Diluted (in dollars per share)	$ 0.29	$ 0.34	$ 0.57	$ 0.65
Weighted average shares excluded from earnings per share calculation (in shares)	264,774	1,275,586	342,056	1,300,026