Segments Information - Other Interest Expense, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segments Information
Other interest expense, net	$ 12,839	$ 9,404
Operating Segments
Segments Information
Other interest expense, net	1,818	1,594
Corporate, Non-Segment
Segments Information
Other interest expense, net	11,021	7,810
Consumer services and plans | Operating Segments
Segments Information
Other interest expense, net	(1)	2
Retail | Operating Segments
Segments Information
Other interest expense, net	$ 1,819	$ 1,592