Goodwill and Intangible Assets Intangible Asset Remaining Useful Life (Details)	9 Months Ended
Sep. 30, 2019
Subscriber relationships
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining useful lives	3 years 8 months 7 days
Distribution rights
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining useful lives	8 years 6 months 31 days

Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration