Equity (parenthetical) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Common Stock Number Of Shares Par Value And Other Disclosures Abstract
Common Stock Par Value Per Share	$ 0.01	$ 0.01
Class A Common Stock
Class Of Stock [Line Items]
Common Stock Shares Authorized	50,000,000	50,000,000
Common Stock Shares Outstanding	7,167,506	7,167,506
Class B Common Stock
Class Of Stock [Line Items]
Common Stock Shares Authorized	150,000,000	150,000,000
Common Stock Shares Outstanding	52,772,208	53,529,136