Consolidated Balance Sheets (unaudited) (Parenthetical) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Common Stock
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,000,000,000	900,000,000
Common stock, shares issued	16,178,037	16,123,288
Common stock, shares outstanding	16,178,037	16,123,288
Class A Common Stock
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	0	11,657,563
Common stock, shares outstanding	0	11,657,563