CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Class A Common Stock
Dividend declared common stock, per share (in dollars per share)	$ 0.187	$ 0.176	$ 0.550	$ 0.517
Class B Common Stock
Dividend declared common stock, per share (in dollars per share)	$ 0.17	$ 0.16	$ 0.50	$ 0.47