Segments Information - Other Interest Expense, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segments Information
Other interest expense, net	$ 16,107	$ 10,557	$ 28,946	$ 19,961
Operating Segments
Segments Information
Other interest expense, net	1,003	1,362	2,821	2,956
Corporate, Non-Segment
Segments Information
Other interest expense, net	15,104	9,195	26,125	17,005
Consumer services and plans | Operating Segments
Segments Information
Other interest expense, net	(1)	2	(2)	4
Retail | Operating Segments
Segments Information
Other interest expense, net	$ 1,004	$ 1,360	$ 2,823	$ 2,952