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Goodwill and Intangible Assets Intangible Asset Remaining Useful Life (Details)
6 Months Ended
Jun. 30, 2019
Subscriber relationships  
Finite-Lived Intangible Assets [Line Items]  
Weighted average remaining useful lives 4 years
Distribution rights  
Finite-Lived Intangible Assets [Line Items]  
Weighted average remaining useful lives 8 years 8 months 31 days