Segments Information (Restated) - Segment Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segments Information
Total segment income	$ 136,521	$ 104,053	$ 206,425	$ 159,490
Selling, general, and administrative expense	(228,444)	(190,323)	(403,934)	(350,711)
Depreciation and amortization	(7,584)	(6,034)	(14,437)	(11,925)
Other interest expense, net	(10,557)	(12,577)	(19,961)	(25,325)
Tax Receivable Agreement liability adjustment			17
Other income (expense), net		(2)		(2)
Income before income taxes	119,377	86,087	174,592	123,634
Operating Segments
Segments Information
Total segment income	141,001	105,411	213,397	162,215
Depreciation and amortization	(7,469)	(6,034)	(14,322)	(11,925)
Other interest expense, net	(1,362)	(1,380)	(2,956)	(2,776)
Corporate, Non-Segment
Segments Information
Selling, general, and administrative expense	(3,483)	(711)	(4,424)	(1,329)
Depreciation and amortization	(115)		(115)
Other interest expense, net	(9,195)	(11,197)	(17,005)	(22,549)
Consumer services and plans | Operating Segments
Segments Information
Total segment income	23,959	22,503	50,212	44,101
Depreciation and amortization	(1,005)	(932)	(2,001)	(1,851)
Other interest expense, net	(2)	(4)	(4)	(8)
Retail | Operating Segments
Segments Information
Total segment income	117,042	82,908	163,185	118,114
Depreciation and amortization	(6,464)	(5,102)	(12,321)	(10,074)
Other interest expense, net	$ (1,360)	$ (1,376)	$ (2,952)	$ (2,768)