Goodwill and Intangible Assets - Intangible Asset Remaining Useful Life (Details)	12 Months Ended
	Dec. 31, 2018
Subscriber relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life in Years	3 years 10 months 24 days
Distribution rights
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life in Years	9 years 3 months 18 days
Proprietary content
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life in Years	6 months
Favorable lease
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life in Years	6 months