Segment Information - Capital Expenditures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segments Information
Capital expenditures	$ 66,780	$ 39,782	$ 41,437
Consumer services and plans
Segments Information
Capital expenditures	3,366	2,951	2,870
Retail
Segments Information
Capital expenditures	$ 63,414	$ 36,831	$ 38,567