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Significant Accounting Policies - Goodwill and Indefinite-Lived Intangibles (Details) | 12 Months Ended
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Dec. 31, 2017
Significant Accounting Policies |
Number of trading days considered to calculate market capitalization | 10 days

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- Definition The number of trading days considered to determine average share price while calculating the adjusted market capitalization. + References No definition available. + Details
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