Goodwill and Intagible Assets - Intangible Asset Remaining Useful Life (Details)	3 Months Ended
	Mar. 31, 2019
Finite-Lived Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets, weighted average remaining useful life	3 years 1 month
Subscriber relationships
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets, weighted average remaining useful life	3 years 7 months 6 days
Distribution rights
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets, weighted average remaining useful life	9 years 1 month 6 days
Proprietary content
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets, weighted average remaining useful life	3 months 18 days
Favorable lease
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets, weighted average remaining useful life	3 months 18 days