EARNINGS PER SHARE (EPS) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
EARNINGS PER SHARE (EPS) [Abstract]
Net income	$ 11,778	$ 10,034
Less: Dividends paid on earnings allocated to participating securities	(41)	(45)
Income attributable to common stock	11,737	9,989
Weighted Average Number Of Shares Outstanding Including Participating Securities Basic (in shares)	36,275,586	36,094,495
Less: weighted average participating securities (in shares)	(288,400)	(317,810)
Weighted average shares outstanding utilized in the calculation of basic EPS (in shares)	35,987,186	35,776,685
Earnings Per Share, Basic (in dollars per share)	$ 0.33	$ 0.28
Income attributable to common stock	$ 11,737	$ 9,989
Weighted average common shares outstanding	35,987,186	35,776,685
Common stock equivalents resulting from the dilutive effect of "in-the-money" stock options	66,273	112,899
Weighted average shares outstanding utilized in the calculation of diluted EPS (in shares)	36,053,459	35,889,584
Earnings Per Share, Diluted (in dollars per share)	$ 0.33	$ 0.28
Weighted average shares excluded from earnings per share calculation (in shares)	205,710	364,715