Fair Value Measurements (Quantitative Information About Significant Unobservable Inputs (Level 3) Used) (Details) - Significant Unobservable Inputs (Level 3) [Member] $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2017 USD ($) $ / ft²	Dec. 31, 2016 USD ($)
Discounted Cash Flows [Member] \| Fixed-Rate Debt [Member] \| Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	3.00%	3.00%
Discounted Cash Flows [Member] \| Fixed-Rate Debt [Member] \| Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	5.30%	5.20%
Discounted Cash Flows [Member] \| Variable-Rate Debt [Member] \| Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	2.10%	1.60%
Discounted Cash Flows [Member] \| Variable-Rate Debt [Member] \| Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	2.80%	2.40%
Discounted Cash Flows [Member] \| Property [Member] \| Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	10.50%
Capitalization rate	8.80%
Holding period (years)	5 years
Average market rent rate \| $ / ft²	11.00
Average leasing cost per square foot \| $ / ft²	10.00
Discounted Cash Flows [Member] \| Property [Member] \| Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	12.00%
Capitalization rate	10.00%
Holding period (years)	10 years
Expected future inflation rate	2.00%
Expense growth rate	2.00%
Vacancy rate	20.00%
Renewal rate	70.00%
Average market rent rate \| $ / ft²	16.00
Average leasing cost per square foot \| $ / ft²	35.00
Discounted Cash Flows [Member] \| Tax Increment Revenue Bonds [Member] \| Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	6.50%	6.50%
Expected future inflation rate	1.00%	1.00%
Discounted Cash Flows [Member] \| Tax Increment Revenue Bonds [Member] \| Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	7.50%	7.50%
Expected future inflation rate	3.00%	3.00%
Fair Value [Member] \| Fixed-Rate Debt [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt \| $	$ 2,128,695	$ 2,132,082
Fair Value [Member] \| Variable-Rate Debt [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt \| $	145,173	265,230
Fair Value [Member] \| Property [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets at fair value \| $	4,184	0
Fair Value [Member] \| Tax Increment Revenue Bonds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investments \| $	$ 23,910	$ 23,910
Market Rent Growth Rate [Member] \| Discounted Cash Flows [Member] \| Property [Member] \| Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Growth rate	3.00%
Expected Future Growth Rate [Member] \| Discounted Cash Flows [Member] \| Tax Increment Revenue Bonds [Member] \| Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Growth rate	1.00%	1.00%
Expected Future Growth Rate [Member] \| Discounted Cash Flows [Member] \| Tax Increment Revenue Bonds [Member] \| Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Growth rate	2.50%	2.00%

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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Ratio of the net operating income produced by an asset and its capital cost (original prices paid to buy the asset), used as an input to measure fair value.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Percentage of assumed long-term growth in revenues, used as an input to measure fair value.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Fair value of investments in debt securities classified as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
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Fair Value Inputs, Average Market Rent Rate

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Represents the expense growth rate used as an input to measure the fair value.

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Fair Value Inputs, Holding Period (Years)

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Represents the leasing costs per square foot used as an input to measure fair value.

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Fair Value Inputs, Renewal Rate

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Fair Value Inputs Vacancy Rate

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