Quarterly report pursuant to Section 13 or 15(d)

Acquisitions, Investments and Licenses - Variable Interest Entities Narrative (Details)

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Acquisitions, Investments and Licenses - Variable Interest Entities Narrative (Details) - Zebra
6 Months Ended
Jun. 30, 2018
shares
Variable Interest Entity [Line Items]  
Ownership percentage, equity method 29.00%
Series A-2 Preferred Stock  
Variable Interest Entity [Line Items]  
Investment owned (in shares) 1,260,000
Restricted Stock  
Variable Interest Entity [Line Items]  
Shares received as a gift (in shares) 900,000