Basis and Summary of Significant Accounting Policies - Narrative (Details) shares in Thousands, £ in Millions			3 Months Ended		12 Months Ended
	May 13, 2016 USD ($) Store	Jan. 29, 2016 USD ($)	Mar. 31, 2017 USD ($) shares	Mar. 31, 2016 USD ($) shares	Dec. 31, 2016 USD ($)	Mar. 31, 2017 GBP (£) Store state	Mar. 31, 2017 USD ($) Store state	Dec. 31, 2016 GBP (£)	Dec. 31, 2016 USD ($)
Significant Accounting Policies [Line Items]
Anti-dilutive securities excluded from the computation of earnings per share assuming dilution (in shares) | shares			530	849
Financing receivable, threshold of past dues financing receivable that requires allowance			24 months
Assets held for sale							$ 8,749,000		$ 8,866,000
Proceeds from divestiture of businesses	$ 35,000,000		$ 71,000	$ (32,000)
Proceeds from sales of building		$ 13,600,000
Building | Other operating expense (income), net
Significant Accounting Policies [Line Items]
Gain on sale of corporate office building				11,100,000
Variable Interest Entity, Not Primary Beneficiary
Significant Accounting Policies [Line Items]
Number of retail stores | Store						41	41
Held to maturity securities						£ 17.1	$ 21,400,000	£ 16.6	$ 20,500,000
Asset Impairment Charges			$ 0
Disposal Group, Held-for-sale, Not Discontinued Operations | HomeSmart
Significant Accounting Policies [Line Items]
Disposal group, number of stores | Store	82
Disposal Group, Disposed of by Sale, Not Discontinued Operations | HomeSmart | Other operating expense (income), net
Significant Accounting Policies [Line Items]
Loss on disposal				$ 4,600,000	$ 4,600,000
Progressive Leasing
Significant Accounting Policies [Line Items]
Number of states in which entity operates | state						46	46