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Consolidated Statements of Changes In Shareholders' Equity (Parenthetical) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Statement of Stockholders' Equity [Abstract]
Cash dividends (in dollars per share)	$ 0.60	$ 0.60
Class B Common Stock
Statement of Stockholders' Equity [Abstract]
Repurchase of Class B common stock (in shares)	12,875	37,688

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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