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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2012
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events In August 2012, the Company's Board of Directors approved a $15.0 million increase in the Company's share repurchase program that authorizes the Company to purchase the Company's Class A common shares. The Company has evaluated events through August 6, 2012 which is the date the condensed consolidated financial statements were available to be issued and has determined that there were no additional subsequent events requiring adjustment or disclosure to the condensed consolidated financial statements.