Earnings Per Share (Schedule of Shares Issued and Outstanding) (Details)	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Class of Stock [Line Items]
Treasury Shares	(8,459,498)	(8,459,498)	(8,463,635)	(8,463,635)
Net shares Outstanding	31,852,239	31,840,489		31,726,490
Common Class A [Member]
Class of Stock [Line Items]
Common Stock, shares issued	37,076,689	37,064,939	36,997,277	36,954,027
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