Dispositions - Assets and Liabilities of Investment Properties Held for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets
Assets associated with investment properties held for sale	$ 0	$ 3,647
Investment properties held for sale
Assets
Land, building and other improvements		2,791
Less accumulated depreciation		(27)
Net investment properties		2,764
Other assets		883
Assets associated with investment properties held for sale		3,647
Liabilities
Other liabilities		0
Liabilities associated with investment properties held for sale		$ 0

Amount classified as accumulated depreciation attributable to disposal group held for sale or disposed of.

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