Quarterly Financial Information (Unaudited) - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Asset Impairment Charges									$ 20,098	$ 0	$ 0
Restructuring Expenses	$ (600)	$ (500)	$ 900	$ (900)	$ (3,400)	$ (800)	$ (13,500)	$ (300)	$ (1,105)	(17,994)	$ (20,218)
Non-cash provisional income tax benefit					137,000
Remeasurement of net deferred tax liabilities					140,000
Estimated expense from loss of manufacturing deduction and other					$ 3,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | HomeSmart
Business Acquisition [Line Items]
Impairment of long-lived assets to be disposed of										$ 1,100