Property and Equipment - Construction in Progress (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Property and equipment
Construction in progress	$ 332,343	$ 307,026
Progress amounts for satellite construction
Property and equipment
Construction in progress	300,447	277,583
Satellite related equipment
Property and equipment
Construction in progress	15,639	13,001
Other
Property and equipment
Construction in progress	$ 16,257	$ 16,442

Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Name:	us-gaap_ConstructionInProgressGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant