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Common Stock	9 Months Ended
Common Stock	Sep. 30, 2012
Equity [Abstract]
Common Stock	Common Stock The Company had 17,019,375 and 16,443,429 shares of Class A common stock outstanding as of September 30, 2012 and December 31, 2011, respectively. The Company had 26,233,008 and 26,540,745 shares of Class B common stock outstanding as of September 30, 2012 and December 31, 2011, respectively.