Segment Information - Other Interest Expense, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segments Information
Other interest expense, net	$ 42,959	$ 48,318	$ 53,377
Operating Segments
Segments Information
Other interest expense, net	5,881	5,414	16,047
Corporate, Non-Segment
Segments Information
Other interest expense, net	37,078	42,904	37,330
Consumer services and plans | Operating Segments
Segments Information
Other interest expense, net	(2)	19	32
Retail | Operating Segments
Segments Information
Other interest expense, net	$ 5,883	$ 5,395	$ 16,015