Segment Information - Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total net assets	$ 992,296	$ 1,099,435
Operating Segments
Segment Reporting Information [Line Items]
Total net assets	976,380	1,082,132
Operating Segments | Media & Content
Segment Reporting Information [Line Items]
Total net assets	371,894	391,669
Operating Segments | Connectivity
Segment Reporting Information [Line Items]
Total net assets	604,486	690,463
Corporate
Segment Reporting Information [Line Items]
Total net assets	$ 15,916	$ 17,303