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Fair Value Measurements - Recurring Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
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 marketable securities	$ 4,431	$ 182,570
Real estate related bonds	0	0
Derivative interest rate swaps	0	0
Total assets	4,431	182,570
Using Significant Other Observable Inputs (Level 2) [Member]
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis
Available-for-sale marketable securities	0	0
Real estate related bonds	327	1,313
Derivative interest rate swaps	1,670	487
Total assets	1,997	1,800
Using Significant Other Unobservable Inputs (Level 3) [Member]
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis
Available-for-sale marketable securities	0	0
Real estate related bonds	0	0
Derivative interest rate swaps	0	0
Total assets	$ 0	$ 0

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Schedule of fair value assets and liabilities measured on recurring basis.

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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

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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

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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=77997519&loc=d3e13433-108611

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