Property and Equipment - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Property, Plant and Equipment [Line Items]
Interest costs capitalized	$ 6,100	$ 4,600	$ 16,400	$ 13,800
Finance lease amortization expense	6,506		19,656
Satellites
Property, Plant and Equipment [Line Items]
Finance lease amortization expense	$ 6,400		$ 19,300
Capital leases amortization expense		$ 5,500		$ 13,800