Properties (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) property	Mar. 31, 2016 USD ($) property	Dec. 31, 2016 USD ($)
Properties
(Loss) gain on sale of investments and other assets, net	$ (56)	$ 245
Summary of properties
Properties, cost	1,994,776		$ 1,986,285
Less: accumulated depreciation	(56,808)		(41,565)
Properties, net	$ 1,937,968		1,944,720
Number of properties sold | property	0	0
Property Segment
Summary of properties
Land and land improvements	$ 387,863		385,860
Buildings	1,295,175		1,291,531
Furniture & fixtures	$ 23,677		23,035
Property Segment | Minimum
Summary of properties
Land improvements, useful life	0 years
Building and building improvements, useful life	5 years
Furniture & fixtures, useful life	3 years
Property Segment | Maximum
Summary of properties
Land improvements, useful life	12 years
Building and building improvements, useful life	40 years
Furniture & fixtures, useful life	7 years
Investment and Servicing Segment
Summary of properties
Land and land improvements	$ 87,245		89,425
Buildings	199,513		195,178
Furniture & fixtures	$ 1,303		$ 1,256
Investment and Servicing Segment | Minimum
Summary of properties
Land improvements, useful life	0 years
Building and building improvements, useful life	3 years
Furniture & fixtures, useful life	3 years
Investment and Servicing Segment | Maximum
Summary of properties
Land improvements, useful life	15 years
Building and building improvements, useful life	40 years
Furniture & fixtures, useful life	5 years