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Shareholders' Equity (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Common Class A [Member]    
Class of Stock [Line Items]    
Common Stock, par value per share $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 0.001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Common Stock reserved for the conversion of Class B Common Stock and the exercise of stock options 3.4us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Number of shares authorized to be repurchased 2.0us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Common Class B [Member]    
Class of Stock [Line Items]    
Common Stock, par value per share $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ 0.001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember