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Subsequent events	3 Months Ended
	Mar. 31, 2013
Subsequent Events [Abstract]
Subsequent events	13. Subsequent events On April 25, 2013, the Company announced a quarterly dividend in the amount of $0.11 per share, payable on May 24, 2013 to holders of Class A non-voting and Class B voting common stock of record on May 10, 2013.

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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