Segment Information - Segment Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segments Information
Total segment income	$ 34,235	$ 87,741	$ 103,351	$ 56,041	$ 24,457	$ 76,221	$ 93,891	$ 49,941	$ 281,368	$ 244,510	$ 185,076
Selling, general, and administrative expense									(691,884)	(634,890)	(536,485)
Depreciation and amortization									(24,695)	(24,101)	(24,601)
Other interest expense, net									(48,318)	(53,377)	(46,769)
Loss and expense on debt restructure									(6,270)		(1,831)
Debt restructure									(5,052)		(1,831)
Other income (expense)										1	(35)
Income before income taxes									209,144	179,886	125,766
As Reported
Segments Information
Total segment income										245,689	186,606
Adjustment
Segments Information
Total segment income										(1,179)	(1,530)
Operating Segments
Segments Information
Total segment income									292,809	260,052	201,599
Depreciation and amortization									(24,695)	(21,870)	(23,178)
Other interest expense, net									(5,414)	(16,047)	(12,122)
Corporate, Non-Segment
Segments Information
Selling, general, and administrative expense									(4,382)	(2,689)	(2,597)
Depreciation and amortization										(2,231)	(1,423)
Other interest expense, net									(42,904)	(37,330)	(34,647)
Consumer services and plans | Operating Segments
Segments Information
Total segment income									89,046	80,522	73,515
Depreciation and amortization									(3,780)	(3,627)	(3,283)
Other interest expense, net									(19)	(32)	(62)
Retail | Operating Segments
Segments Information
Total segment income		87,741	103,351	56,041	25,203	76,568	93,544	49,195	203,763	179,530	128,084
Selling, general, and administrative expense		(186,255)	(190,323)	(160,388)	(148,994)	(174,141)	(173,565)	(138,190)		(634,890)	(536,485)
Depreciation and amortization									(20,915)	(18,243)	(19,895)
Other interest expense, net									$ (5,395)	(16,015)	(12,060)
Retail | Operating Segments | As Reported
Segments Information
Total segment income		87,003	101,877	56,871	26,718	76,423	92,861	49,687			129,600
Selling, general, and administrative expense		(188,858)	(192,947)	(163,149)	(152,064)	(176,466)	(175,686)	(140,193)		(644,409)	(544,107)
Retail | Operating Segments | Adjustment
Segments Information
Total segment income		738	1,474	(830)	(1,515)	145	683	(492)			(1,500)
Selling, general, and administrative expense		$ 2,603	$ 2,624	$ 2,761	$ 3,070	$ 2,325	$ 2,121	$ 2,003		$ 9,519	$ 7,622