Segments Information - Segment Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segments Information
Total segment income	$ 69,757	$ 56,041
Selling, general, and administrative expense	(175,490)	(160,388)
Depreciation and amortization	(6,853)	(5,891)
Other interest expense, net	(9,404)	(12,748)
Other income (expense), net	17
Income before income taxes	55,068	38,151
Operating Segments
Segments Information
Total segment income	72,249	57,408
Other interest expense, net	(1,594)	(1,396)
Corporate, Non-Segment
Segments Information
Selling, general, and administrative expense	(941)	(618)
Other interest expense, net	(7,810)	(11,352)
Consumer services and plans | Operating Segments
Segments Information
Total segment income	26,253	21,598
Depreciation and amortization	(996)	(919)
Other interest expense, net	(2)	(4)
Retail | Operating Segments
Segments Information
Total segment income	45,996	35,810
Depreciation and amortization	(5,857)	(4,972)
Other interest expense, net	$ (1,592)	$ (1,392)