Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Stockholders' deficit:
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares Authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Class A Common Stock [Member]
Stockholders' deficit:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares Authorized	500,000,000	500,000,000
Common stock, shares issued	87,027,234	85,935,116
Common stock, shares outstanding	87,027,234	85,935,116
Class B Common Stock [Member]
Stockholders' deficit:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares Authorized	250,000,000	250,000,000
Common stock, shares issued	52,495,236	53,563,460
Common stock, shares outstanding	52,495,236	53,563,460