Net Income Per Share of Common Stock (Details)	3 Months Ended							12 Months Ended
	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
NET INCOME PER SHARE OF COMMON STOCK [Abstract]
Common Stock Dividend Declared, Percent								20.00%	10.00%	10.00%
Average shares outstanding	12,973,095	13,021,478	13,012,497	12,857,950	11,704,135	11,714,133	11,723,618	15,579,571	15,451,314	15,373,756