Risk Management and Use of Derivative Financial Instruments (Narratives) (Details) - USD ($)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Derivative Instrument Detail
Collateral received	$ 0
Total credit exposure on derivatives	41,900,000
Derivatives, net liability position	11,400,000	$ 18,500,000
Aggregate termination value for immediate settlement	11,900,000	$ 19,100,000
Other income and (expense)
Derivative Instrument Detail
Estimated amount reclassified from OCI to income, derivatives	8,000,000
Interest expense
Derivative Instrument Detail
Estimated amount reclassified from OCI to income, derivatives	5,800,000
Single Counterparty
Derivative Instrument Detail
Total credit exposure on derivatives	$ 17,500,000
Lease revenue \| KBR, Inc
Derivative Instrument Detail
Concentration risk, percentage	11.00%
Lease revenue \| A-American Self-Storage
Derivative Instrument Detail
Concentration risk, percentage	7.00%
Lease revenue \| New York Times Company
Derivative Instrument Detail
Concentration risk, percentage	7.00%
Lease revenue \| Metro Cash & Italia S.p.A
Derivative Instrument Detail
Concentration risk, percentage	6.00%
Lease revenue \| Agrokor d.d.
Derivative Instrument Detail
Concentration risk, percentage	5.00%

The aggregate fair value of assets needed to immediately settle the derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624258-113959

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592

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- Definition

Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4K
-Subparagraph (b)(1)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Credit Derivative
-URI http://asc.fasb.org/extlink&oid=6854095

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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No definition available.

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The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

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- Definition

The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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