Fair Value Measurement (Quantitative Information) (Details) - Fair Value Using Significant Unobservable Inputs (Level 3) [Member] $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) $ / ft²	Dec. 31, 2016 USD ($)
Fair Value [Member] \| Real Estate Investment Property [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property \| $	$ 4,184	$ 0
Fair Value [Member] \| US States and Political Subdivisions Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Tax increment revenue bonds \| $	$ 25,000	$ 23,910
Discounted Cash Flows [Member] \| Minimum [Member] \| Real Estate Investment Property [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	10.50%
Capitalization rate	8.80%
Holding period (years)	5 years
Average market rent rate \| $ / ft²	11.00
Average leasing costs per square foot \| $ / ft²	10.00
Discounted Cash Flows [Member] \| Minimum [Member] \| US States and Political Subdivisions Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	6.50%	6.50%
Expected future inflation rate	1.00%	1.00%
Discounted Cash Flows [Member] \| Maximum [Member] \| Real Estate Investment Property [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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 costs per square foot \| $ / ft²	35.00
Discounted Cash Flows [Member] \| Maximum [Member] \| US States and Political Subdivisions Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	7.50%	7.50%
Expected future inflation rate	3.00%	3.00%
Market Rent Growth Rate [Member] [Member] \| Discounted Cash Flows [Member] \| Maximum [Member] \| Real Estate Investment Property [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Growth rate	3.00%
Expected Future Growth Rate [Member] \| Discounted Cash Flows [Member] \| Minimum [Member] \| US States and Political Subdivisions Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Growth rate	1.00%	1.00%
Expected Future Growth Rate [Member] \| Discounted Cash Flows [Member] \| Maximum [Member] \| US States and Political Subdivisions Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Growth rate	2.30%	2.00%
Fixed-Rate Debt [Member] \| Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Rate of debt \| $	$ 2,109,658	$ 2,132,082
Fixed-Rate Debt [Member] \| Discounted Cash Flows [Member] \| Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	3.00%	3.00%
Fixed-Rate Debt [Member] \| Discounted Cash Flows [Member] \| Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	5.30%	5.20%
Variable Rate Debt [Member] \| Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Rate of debt \| $	$ 16,393	$ 265,230
Variable Rate Debt [Member] \| Discounted Cash Flows [Member] \| Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	2.40%	1.60%
Variable Rate Debt [Member] \| Discounted Cash Flows [Member] \| Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	3.20%	2.40%

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
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-Subparagraph (a)
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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
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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.

+ References

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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Fair value of investments in debt securities classified as held-to-maturity.

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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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