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Fair Value Measurements (Details) - Level 2 [Member] - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets:
Interest Rate Derivative Assets, at Fair Value	$ 7,701	$ 9,484
Total	8,422	12,750
Liabilities:
Interest Rate Derivative Liabilities, at Fair Value	16,979	24,411
Total	16,979	24,411
Investments [Member]
Assets:
Investments, Fair Value Disclosure	708	3,254
Demand Obligation [Member]
Assets:
Investments, Fair Value Disclosure	$ 13	$ 12

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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)
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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
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-Topic 825
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Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

+ References

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6526789

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-Name Accounting Standards Codification
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Fair value of financial and nonfinancial obligations.

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