Quarterly Financial Information (Unaudited) - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended					12 Months Ended
	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Restructuring expenses	$ 15,500				$ 4,700	$ 20,218	$ 0	$ 9,140
Business Acquisition [Line Items]
Retirement benefits expense			$ 3,700			0	0	9,094
Acquisition related costs						0	0	6,638
DAMI | Subsidiaries
Business Acquisition [Line Items]
Acquisition related costs				$ 2,700			3,700
Operating Segments
Quarterly Financial Information Disclosure [Abstract]
Restructuring expenses								9,140
Sales and Lease Ownership | Operating Segments
Quarterly Financial Information Disclosure [Abstract]
Restructuring expenses								$ 4,836
Business Acquisition [Line Items]
Loss related to lease termination							$ 3,500
Building | Other Segments | Operating Segments
Business Acquisition [Line Items]
Gain on sale of corporate office building			11,100
Disposal Group, Disposed of by Sale, Not Discontinued Operations | HomeSmart
Business Acquisition [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