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Risk Management and Use of Financial Instruments - Terms and Fair Values of Derivative Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Other Liabilities [Member] |  |
Derivatives Fair Value [Line Items] |  |
Notional Amount | $ 328,610 | $ 278,610
Other Liabilities [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | 3.623% Interest Rate Swap Maturing February 1, 2019 [Member] |  |
Derivatives Fair Value [Line Items] |  |
Derivative Liability, Notional Amount | $ 0 | 200,000
Derivative, Fixed Interest Rate | 3.623% |
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement | $ 0 | (2,649)
Other Liabilities [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | 3.300% Interest Rate Swap Maturing January 30, 2021 [Member] |  |
Derivatives Fair Value [Line Items] |  |
Derivative Liability, Notional Amount | $ 25,774 | 25,774
Derivative, Fixed Interest Rate | 3.30% |
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement | $ (531) | (334)
Other Liabilities [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | 3.090% Interest Rate Swap Maturing October 30, 2019 [Member] |  |
Derivatives Fair Value [Line Items] |  |
Derivative Liability, Notional Amount | $ 25,774 | 25,774
Derivative, Fixed Interest Rate | 3.09% |
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement | $ (388) | (254)
Other Liabilities [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | 2.750% Interest Rate Swap Maturing September 30, 2017 [Member] |  |
Derivatives Fair Value [Line Items] |  |
Derivative Liability, Notional Amount | $ 27,062 | 27,062
Derivative, Fixed Interest Rate | 2.75% |
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement | $ (201) | (253)
Other Assets [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | 3.718% Interest Rate Swap Maturing October 8, 2022 [Member] |  |
Derivatives Fair Value [Line Items] |  |
Derivative, Fixed Interest Rate | 3.718% |
Derivative Asset, Notional Amount | $ 250,000 | 0
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement | $ 1,884 | $ 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, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5580258-113959 + Details
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