EARNINGS PER SHARE (EPS) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
EARNINGS PER SHARE (EPS) [Abstract]
Net income	$ 10,570	$ 10,247
Less: Dividends paid on earnings allocated to participating securities	(46)	(45)
Income attributable to common stock	10,524	10,202
Weighted Average Number Of Shares Outstanding Including Participating Securities Basic	34,823,296	34,045,677
Less: weighted average participating securities	(325)	(324)
Weighted average shares outstanding utilized in the calculation of basic EPS	34,822,971	34,045,353
Earnings Per Share, Basic	$ 0.30	$ 0.30
Income attributable to common stock	$ 10,524	$ 10,202
Weighted average common shares outstanding	34,822,971	34,045,353
Common stock equivalents resulting from the dilutive effect of "in-the-money" stock options	56,268	96,222
Weighted average shares outstanding utilized in the calculation of diluted EPS (in shares)	34,879,239	34,141,575
Earnings Per Share, Diluted	$ 0.30	$ 0.30
Weighted average shares excluded from earnings per share calculation (in shares)	1,300,035	1,282,607