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Fair Value Measurements - Quantitative Disclosure of The Fair Value For Each Major Category Of Assets And Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Level 2 | Interest Rate Swap |  |
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis |  |
Notional value of outstanding interest rate swaps | $ 150,000 | $ 150,000
Recurring | Level 1 |  |
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis |  |
Marketable equity securities | 1,078 | 4,431
Real estate related bonds | 0 | 0
Derivative interest rate swaps | 0 | 0
Total assets | 1,078 | 4,431
Recurring | Level 2 |  |
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis |  |
Marketable equity securities | 0 | 0
Real estate related bonds | 307 | 327
Derivative interest rate swaps | 2,295 | 1,670
Total assets | 2,602 | 1,997
Recurring | Level 3 |  |
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis |  |
Marketable 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://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 + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + 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 No definition available. + Details
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