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

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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