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Basis of Presentation (Details) - company | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Basis of Presentation |  |  |  |
Equity method investments | 7 | 7 | 7 | 7

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- References No definition available. + Details
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