Fair Value Measurements (Quantitative Information About Significant Unobservable Inputs (Level 3) Used) (Details) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) $ / ft²	Sep. 30, 2018 USD ($)
Significant Unobservable Inputs (Level 3) [Member] \| Valuation Technique, Discounted Cash Flow [Member] \| Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Holding period (years)	5 years
Average market rent rate \| $ / ft²	11.00
Average leasing cost per square foot \| $ / ft²	10.00
Significant Unobservable Inputs (Level 3) [Member] \| Valuation Technique, Discounted Cash Flow [Member] \| Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Holding period (years)	10 years
Average market rent rate \| $ / ft²	16.00
Average leasing cost per square foot \| $ / ft²	35.00
Measurement Input, Discount Rate [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Valuation Technique, Discounted Cash Flow [Member] \| Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-financial asset, measurement input	10.50%
Measurement Input, Discount Rate [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Valuation Technique, Discounted Cash Flow [Member] \| Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-financial asset, measurement input	12.00%
Measurement Input, Capitalization Rate [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Valuation Technique, Discounted Cash Flow [Member] \| Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-financial asset, measurement input	8.80%
Measurement Input, Capitalization Rate [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Valuation Technique, Discounted Cash Flow [Member] \| Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-financial asset, measurement input	10.00%
Measurement Input, Price Volatility [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Valuation Technique, Discounted Cash Flow [Member] \| Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-financial asset, measurement input	2.00%
Measurement Input, Long-term Revenue Growth Rate [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Valuation Technique, Discounted Cash Flow [Member] \| Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-financial asset, measurement input	3.00%
Measurement Input, Expense Growth Rate [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Valuation Technique, Discounted Cash Flow [Member] \| Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-financial asset, measurement input	2.00%
Measurement Input, Vacancy Rate [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Valuation Technique, Discounted Cash Flow [Member] \| Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-financial asset, measurement input	20.00%
Measurement Input, Renewal Rate [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Valuation Technique, Discounted Cash Flow [Member] \| Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-financial asset, measurement input	70.00%
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets at fair value disclosure	$ 17,085	$ 48,485
Property, plant, and equipment, fair value disclosure	17,085	9,292
Fair Value, Measurements, Nonrecurring [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets at fair value disclosure	4,184	0
Property, plant, and equipment, fair value disclosure	4,184
Fair Value, Measurements, Nonrecurring [Member] \| Fair Value [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Property, plant, and equipment, fair value disclosure	$ 17,100	$ 9,300

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
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