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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 | Jun. 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 | 1,064 | 4,431
Real estate related bonds | 0 | 0
Derivative interest rate swaps | 0 | 0
Total assets | 1,064 | 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 | 2,437 | 1,670
Total assets | 2,744 | 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://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=75030427&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=82897076&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=82896770&loc=d3e26610-111562 + Details
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