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Fair Value Measurements (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Interest Rate Swap [Member] | Using Significant Other Observable Inputs (Level 2) [Member] |  |
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis |  |
Notiional value of outstanding interest rate swaps | $ 150,000 | $ 150,000
Fair Value, Measurements, Recurring [Member] | Using Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis |  |
Available-for-sale real estate equity securities | 30,968 | 182,569
Real estate related bonds | 0 | 0
Derivative interest rate swaps | 0 | 0
Total assets | 30,968 | 182,569
Fair Value, Measurements, Recurring [Member] | Using Significant Other Observable Inputs (Level 2) [Member] |  |
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis |  |
Available-for-sale real estate equity securities | 0 | 0
Real estate related bonds | 574 | 1,314
Derivative interest rate swaps | 802 | 487
Total assets | 1,376 | 1,801
Fair Value, Measurements, Recurring [Member] | Using Significant Other Unobservable Inputs (Level 3) [Member] |  |
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis |  |
Available-for-sale real estate equity securities | 0 | 0
Real estate related bonds | 0 | 0
Derivative interest rate swaps | 0 | 0
Total assets | $ 0 | $ 0

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References 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 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + 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) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 + Details
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