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Common Stock	6 Months Ended
Common Stock	Jun. 30, 2012
Equity [Abstract]
Common Stock	Common Stock The Company had 16,890,002 and 16,443,429 shares of Class A common stock outstanding as of June 30, 2012 and December 31, 2011, respectively. The Company had 26,338,748 and 26,540,745 shares of Class B common stock outstanding as of June 30, 2012 and December 31, 2011, respectively.