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Shareholders' Equity (Narrative) (Details) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Aug. 31, 2006
Class of Stock [Line Items]
Common Stock reserved for the conversion of Class B Common Stock and the exercise of stock options	3.8
Number of shares authorized to be repurchased			2.0
Dividends	$ 4,069	$ 3,744
Common Class A [Member]
Class of Stock [Line Items]
Common Stock, par value per share	$ 0.001	$ 0.001
Common Class B [Member]
Class of Stock [Line Items]
Common Stock, par value per share	$ 0.001	$ 0.001

Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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