Acquisitions - Past Franchisee Acquisition (Details) - USD ($) $ in Thousands	Jul. 27, 2017	Sep. 30, 2018	Dec. 31, 2017
Estimated Fair Value of Identifiable Assets Acquired and Liabilities Assumed
Goodwill		$ 703,437	$ 622,948
SEI
Business Acquisition [Line Items]
Purchase Price	$ 140,000
Settlement of Pre-existing Accounts Receivable SEI owed Aaron's, Inc.	3,452
Reimbursement for Insurance Costs	(100)
Working Capital Adjustment	188
Consideration Transferred	143,540
Estimated Fair Value of Identifiable Assets Acquired and Liabilities Assumed
Cash and Cash Equivalents	34
Receivables	1,345
Lease Merchandise	40,941
Property, Plant and Equipment	8,832
Other Intangibles	13,779
Prepaid Expenses and Other Assets	440
Total Identifiable Assets Acquired	65,371
Accounts Payable and Accrued Expenses	(6,698)
Customer Deposits and Advance Payments	(2,500)
Capital Leases	(4,514)
Total Liabilities Assumed	(13,712)
Goodwill	91,881
Net Assets Acquired	$ 51,659