Property and Equipment - Construction in Progress (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Construction in progress	$ 388,189	$ 307,026
Progress amounts for satellite construction
Property, Plant and Equipment [Line Items]
Construction in progress	348,106	277,583
Satellite related equipment
Property, Plant and Equipment [Line Items]
Construction in progress	25,027	13,001
Other
Property, Plant and Equipment [Line Items]
Construction in progress	$ 15,056	$ 16,442