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Recent Accounting Pronouncements (Narrative) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($) lease
Accounting Policies [Abstract]
Income earned from leasing as a percentage of revenue	97.00%
Percentage of revenue excluded from scope of accounting standards update 2014-09	1.00%
Number of ground lease arrangements as a lessee (lease) | lease	11
Future contractual lease payments | $	$ 15,199

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Lessee Leasing Arrangements, Number of Leases

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
-URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717

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