Earnings Per Share (Schedule of Shares Issued and Outstanding) (Details)	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013
Class of Stock [Line Items]
Less: Treasury Shares	(8,459,498)	(8,463,635)	(8,463,635)	(8,463,635)
Net shares Outstanding	31,840,489	31,821,802		31,647,590
Common Class A [Member]
Class of Stock [Line Items]
Common Stock, shares issued	37,064,939	37,050,389	36,997,277	36,875,127
Common Class B [Member]
Class of Stock [Line Items]
Common Stock, shares issued	3,235,048	3,235,048	3,235,048	3,236,098
Net shares Outstanding	3,235,048		3,235,048