Segments Information - Segment Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segments Information
Total segment income	$ 49,753	$ 69,904
Selling, general, and administrative expense	(245,114)	(175,490)
Depreciation and amortization	(9,400)	(6,853)
Other interest expense, net	(12,839)	(9,404)
Tax Receivable Agreement liability adjustment		17
Loss and expense on debt restructure	(2,100)
Income before income taxes	24,495	55,215
Operating Segments
Segments Information
Total segment income	50,131	72,396
Other interest expense, net	(1,818)	(1,594)
Corporate, Non-Segment
Segments Information
Selling, general, and administrative expense	(1,297)	(941)
Other interest expense, net	(11,021)	(7,810)
Consumer services and plans | Operating Segments
Segments Information
Total segment income	28,124	26,253
Depreciation and amortization	(772)	(996)
Other interest expense, net	1	(2)
Retail | Operating Segments
Segments Information
Total segment income	22,007	46,143
Depreciation and amortization	(8,628)	(5,857)
Other interest expense, net	$ (1,819)	$ (1,592)