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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
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

X

- 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

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- Definition

Real estate related bonds.

+ References

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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

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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

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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.

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