Earnings Per Share (Schedule of Shares Issued and Outstanding) (Details)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Class of Stock [Line Items]
Less: Treasury Shares	(8,463,635)	(8,463,635)	(8,467,873)
Net shares Outstanding	31,821,802	31,768,690	31,595,452
Common Class A [Member]
Class of Stock [Line Items]
Common Stock, shares issued	37,049,339	36,996,227	36,827,227
Common Class B [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