CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Class A Common Stock
Dividend declared common stock, per share (in dollars per share)	$ 0.187	$ 0.176	$ 0.363	$ 0.341
Class B Common Stock
Dividend declared common stock, per share (in dollars per share)	$ 0.170	$ 0.160	$ 0.330	$ 0.310