EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Numerator [Abstract]
Net Income - Basic									$ 21,962	$ 31,549	$ 15,302
Net Income - Diluted									$ 21,962	$ 31,549	$ 15,302
Denominator - Weighted Avg Shares of Common Stock Outstanding [Abstract]
Basic (in shares)									7,195,606	7,131,820	7,158,439
Plus: Effect of dilutive restrictive stock (in shares)									17,682	44,827	72,739
Diluted (in shares)									7,213,288	7,176,647	7,231,178
Basic and Diluted Earnings Per Common Share [Abstract]
Net Income -Basic (in dollars per share)	$ 1.60	$ 0.25	$ 0.10	$ 1.11	$ 0.25	$ 0.40	$ 0.39	$ 3.33	$ 3.05	$ 4.42	$ 2.14
Net Income -Diluted (in dollars per share)	$ 1.60	$ 0.25	$ 0.10	$ 1.11	$ 0.25	$ 0.40	$ 0.39	$ 3.32	$ 3.04	$ 4.40	$ 2.12