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Common Stock	6 Months Ended
Common Stock	Jun. 30, 2011
Equity [Abstract]
Common Stock	(5) Common Stock The Company had 16,213,617 and 15,598,632 shares of Class A common stock outstanding as of June 30, 2011 and December 31, 2010, respectively. The Company had 26,751,304 and 27,202,062 shares of Class B common stock outstanding as of June 30, 2011 and December 31, 2010, respectively.