EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
EARNINGS PER SHARE
Weighted average restricted stock units participating securities	500,000	900,000	500,000	900,000
Options to purchase shares that were not included in computing diluted earnings per share due to their anti-dilutive effect	300,000	200,000	300,000	200,000
Basic Earning per share
Undistributed income	$ 13,619	$ 14,588	$ 48,933	$ 26,715
Weighted average shares - Basic	34,451,000	33,976,000	34,346,000	33,971,000
Total basic earnings per common share	$ 0.39	$ 0.42	$ 1.41	$ 0.77
Restricted stock units participating securities
Basic Earning per share
Undistributed income	121	376	639	690
Common Stock
Basic Earning per share
Undistributed income	$ 13,498	$ 14,212	$ 48,294	$ 26,025
Weighted average shares - Basic	34,451,000	33,976,000	34,346,000	33,971,000
Total basic earnings per common share	$ 0.39	$ 0.42	$ 1.41	$ 0.77