Business and Summary of Significant Accounting Policies - Lease Merchandise (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Significant Accounting Policies [Line Items]
Lease merchandise salvage value percentage	0.00%
Lease Merchandise, net of Accumulated Depreciation and Allowances	$ 1,152,135	$ 999,381
Allowance for Lease Merchandise Write offs:
Beginning Balance	33,399	33,405	$ 27,573
Merchandise Written off, net of Recoveries	(143,230)	(134,110)	(130,548)
Provision for Write-offs	145,460	134,104	136,380
Ending Balance	$ 35,629	33,399	$ 33,405
Agreement One | Progressive Leasing
Significant Accounting Policies [Line Items]
Lease agreement period	12 months
Merchandise on Lease
Significant Accounting Policies [Line Items]
Lease Merchandise, net of Accumulated Depreciation and Allowances	$ 908,268	786,936
Merchandise on Lease | Minimum
Significant Accounting Policies [Line Items]
Lease merchandise useful life	12 months
Merchandise on Lease | Maximum
Significant Accounting Policies [Line Items]
Lease merchandise useful life	24 months
Merchandise Not on Lease
Significant Accounting Policies [Line Items]
Lease merchandise useful life	36 months
Lease Merchandise, net of Accumulated Depreciation and Allowances	$ 243,867	$ 212,445