Gain on Sales of Real Estate (Details) $ in Thousands	3 Months Ended
Mar. 31, 2018 USD ($) property	Mar. 31, 2017 USD ($) property
Gain on Sales of Real Estate
Property Sales Count \| property	14	14
Proceeds from sales of real estate	$ 13,779	$ 31,232
Gain on sales of properties	$ 3,200	$ 10,500

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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