Business and Summary of Significant Accounting Policies - Summary of Goodwill by Reporting Unit (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) reporting_unit segments	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Goodwill [Line Items]
Number of operating segments | segments	5
Number of reporting units | reporting_unit	5
Goodwill	$ 526,723	$ 539,475	$ 530,670
Sales and Lease Ownership
Goodwill [Line Items]
Goodwill	237,922	233,851	226,828
Progressive
Goodwill [Line Items]
Goodwill	288,801	290,605	289,184
HomeSmart
Goodwill [Line Items]
Goodwill	0	14,729	14,658
DAMI
Goodwill [Line Items]
Goodwill	$ 0	$ 290	$ 0