Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Class A common stock
Current liabilities:
Redeemable common securities	1,152.27	597.52
Stockholders' equity:
Common stock, shares authorized	40,000	40,000
Common stock, shares issued	19,051.31	18,307.79
Common stock, shares outstanding	19,051.31	18,307.79
Common stock, par value	$ 0.01	$ 0.01
Class B common stock
Stockholders' equity:
Common stock, shares authorized	15,200	15,200
Common stock, shares issued	11,918.71	11,918.71
Common stock, shares outstanding	11,918.71	11,918.71
Common stock, par value	$ 0.01	$ 0.01