Unconsolidated Real Estate Joint Ventures (Narrative) (Details) (USD $)	12 Months Ended	0 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 08, 2013
Payments to Acquire Productive Assets	$ 85,205,000	$ 123,497,000	$ 73,188,000
Gain on previously held equity interest	0	4,853,000	0
Gain on sale or acquisition, net	1,209,000	3,017,000	0
Income from investments in unconsolidated real estate joint venture	1,273,000	1,398,000	1,025,000
Distributions from joint ventures	810,000	985,000	1,046,000
Atlantic-EPR I and II [Member]
Number of unconsolidated joint ventures				2
Payments to Acquire Productive Assets				18,600,000
Gain on sale or acquisition, net		3,200,000
Mortgage Loans on Real Estate, New Mortgage Loans				33,100,000
Income from investments in unconsolidated real estate joint venture		505,000	536,000
Distributions from joint ventures		646,000	1,000,000
Theatre Project China [Member]
Number of unconsolidated joint ventures	3	3
Income from investments in unconsolidated real estate joint venture	1,300,000	893,000	489,000
Investment in joint ventures	5,700,000	5,300,000
Distributions from joint ventures	$ 810,000	$ 339,000

Gains Losses On Sales Or Acquisitions Of Real Estate

No definition available.

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- Definition

Number of Equity Method Investments

+ References

No definition available.

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- Definition

In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)(2)

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- Definition

This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

+ References

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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

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-SubTopic 10

-Section S99

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- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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

-Publisher FASB

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-SubTopic 10

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-Paragraph 28

-Subparagraph (b)

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- Definition

Total amount of new mortgage loans on real estate during the reporting period.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-04.(c) Schedule IV)

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- Definition

The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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