| http://www.w3.org/ns/prov#value | - As of March 31, 2013, we had 23.4 million shares of Class A common stock and 9.7 million shares of Class B common stock outstanding.All shares of Class A common stock are freely tradable without restrictions or further registration under the Securities Act of 1933, as amended, or the Securities Act, except for any shares held by our affiliates as defined in Rule 144 under the Securities Act.The ho
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