Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Equity:
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	200,000,000	200,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Class A
Equity:
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized	900,000,000	700,000,000
Common stock, shares issued	168,795,956	100,086,387
Common stock, shares outstanding	168,795,956	100,086,387
Class B
Equity:
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	300,000,000
Common stock, shares issued	57,283,127	114,566,254
Common stock, shares outstanding	57,283,127	114,566,254