Earnings Per Share (Schedule of Shares Issued and Outstanding) (Details)	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Class of Stock [Line Items]
Less: Treasury Shares	(8,467,873)	(8,467,873)	(8,479,487)
Net shares Outstanding	31,397,829	31,357,529	31,297,453
Class A Common Stock [Member]
Class of Stock [Line Items]
Common Stock, shares issued	36,629,604	36,589,304	36,540,842
Net shares Outstanding	36,629,604		36,540,842
Class B Common Stock [Member]
Class of Stock [Line Items]
Common Stock, shares issued	3,236,098	3,236,098	3,236,098
Net shares Outstanding	3,236,098		3,236,098