EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
EARNINGS PER SHARE
Weighted average restricted stock units participating securities	500,000	900,000
Options to purchase shares that were not included in computing diluted earnings per share due to their anti-dilutive effect	200,000	200,000
Basic Earning per share
Undistributed income	$ 35,313	$ 12,128
Weighted average shares - Basic	34,240,000	33,967,000
Total basic earnings per common share	$ 1.02	$ 0.35
Restricted stock units participating securities
Basic Earning per share
Undistributed income	518	315
Common Stock
Basic Earning per share
Undistributed income	$ 34,795	$ 11,813
Weighted average shares - Basic	34,240,000	33,967,000
Total basic earnings per common share	$ 1.02	$ 0.35