Risk Management and Use of Derivative Financial Instruments (Narratives) (Details) - USD ($)	6 Months Ended
Jun. 30, 2015	Dec. 31, 2014
Derivative Instrument Detail
Collateral received	$ 0
Total credit exposure on derivatives	41,400,000
Derivatives, net liability position	19,900,000	$ 18,500,000
Aggregate termination value for immediate settlement	20,400,000	$ 19,100,000
Interest expense
Derivative Instrument Detail
Estimated amount reclassified from OCI to income, derivatives	6,500,000
Other income and expense
Derivative Instrument Detail
Estimated amount reclassified from OCI to income, derivatives	$ 7,200,000
New York Times Company \| Lease revenue
Derivative Instrument Detail
Concentration risk, percentage	9.00%
Metro Cash & Italia S.p.A \| Lease revenue
Derivative Instrument Detail
Concentration risk, percentage	8.00%
Agrokor d.d. \| Lease revenue
Derivative Instrument Detail
Concentration risk, percentage	7.00%
KBR, Inc \| Lease revenue
Derivative Instrument Detail
Concentration risk, percentage	7.00%
Combined Tenants \| Lease revenue
Derivative Instrument Detail
Concentration risk, percentage	6.00%
Single counterparty
Derivative Instrument Detail
Total credit exposure on derivatives	$ 19,100,000

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

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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

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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

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-Name Accounting Standards Codification

-Glossary Credit Derivative

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

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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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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.

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