Basis of Financial Statement Presentation (Tables)

3 Months Ended

Mar. 31, 2013

Basis of Financial Statement Presentation [Abstract]

Revision of EPS Presentation

For the quarter ended March 31, 2012:

	As previously reported		As revised
Basic EPS – Class A common	$	0.69	$	0.84
Basic EPS – Class B common	$	0.69	$	0.42
Diluted EPS – Class A common	$	0.69	$	0.69
Diluted EPS – Class B common	$	0.69	$	0.42