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Investments (Cost Method Investments) (Details) | Dec. 31, 2017
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Telltale |
Schedule of Cost-method Investments [Line Items] |
Cost method investments, ownership percentage | 14.00%

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- Definition Cost Method Investments, Ownership Percentage + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |