Acquisitions and Divestitures - Divestiture and Spin-off (Details) shares in Thousands, $ in Thousands							12 Months Ended
	Dec. 09, 2016 shares	Oct. 31, 2016 USD ($)	Apr. 20, 2015 shares	Apr. 11, 2014 shares	Jan. 31, 2014 USD ($) item shares	Jan. 24, 2014	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Divestiture and Spin-Off
Gain on sale of investments and other assets							$ 1,942	$ 22,664	$ 13,829
Cost method investment							$ 28,014	$ 18,169
Shares issued | shares	20,470		13,800	25,300
Summarized consolidated results of discontinued operations for the SFR segment prior to the spin-off
Net loss									(1,551)
Situs
Divestiture and Spin-Off
Ownership percentage		6.25%
Cost method investment		$ 12,200
Single Family Residential
Summarized consolidated results of discontinued operations for the SFR segment prior to the spin-off
Total revenues									3,876
Total costs and expenses									6,369
Loss before other income and income taxes									(2,493)
Total other income									942
Loss before income taxes									(1,551)
Net loss									$ (1,551)
Equity interest in a servicing and advisory business
Divestiture and Spin-Off
Carrying value of net assets contributed in exchange for equity interest		3,200
Gain on sale of investments and other assets		200
Loss resulting from release of accumulated foreign currency translation adjustment component of equity		$ 8,800
SWAY
Divestiture and Spin-Off
Net assets					$ 1,100,000
Number of units of single-family homes | item					7,200
Shares issued | shares					40,100
Spin-off | Single Family Residential
Divestiture and Spin-Off
Share exchange ratio						0.20
Cash contribution					$ 100,000