Segments - Narrative (Details) $ in Thousands		3 Months Ended								12 Months Ended
	Jan. 29, 2016 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2017 USD ($) segment segments	Dec. 31, 2016 USD ($)	Oct. 15, 2016 USD ($)	Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segments										3
Number of reportable segments | segment										3
Restructuring Expenses		$ 3,400	$ 800	$ 13,500	$ 300	$ 15,500			$ 4,700	$ 17,994	$ 20,218		$ 0
Operating Segments | Sales and Lease Ownership
Segment Reporting Information [Line Items]
Loss related to lease termination													$ 3,500
Operating Segments | Progressive Leasing
Segment Reporting Information [Line Items]
Acquisition related costs												$ 3,700
HomeSmart | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Segment Reporting Information [Line Items]
Charge related to write down of disposal group								$ 4,600
Impairment of long-lived assets to be disposed of							$ 1,000				1,100
Other operating expense (income) | HomeSmart | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Segment Reporting Information [Line Items]
Charge related to write down of disposal group											4,300
Gain on sale of corporate office building	$ 11,100
Facility Closing | Operating Segments | Sales and Lease Ownership
Segment Reporting Information [Line Items]
Restructuring Expenses										17,523	20,218
2016 Restructuring Program
Segment Reporting Information [Line Items]
Restructuring Expenses										$ 15,000	20,218
2016 Restructuring Program | Facility Closing | Operating Segments
Segment Reporting Information [Line Items]
Restructuring Expenses											$ 20,200