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Investments (Cost Method Investments) (Details)	Dec. 31, 2017
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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- 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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- Details

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