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Other Investments (Schedule of Other Investments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Equity method investments, carrying value	$ 422,853		$ 321,241
Earnings (losses) from equity method investments	3,332	$ 5,702
Other strategic investments
Schedule of Equity Method Investments [Line Items]
Equity method investments, carrying value	12,234		13,618
Earnings (losses) from equity method investments	(494)	247
Real estate equity investments
Schedule of Equity Method Investments [Line Items]
Equity method investments, carrying value	410,619		307,623
Earnings (losses) from equity method investments	3,826	5,455
Real estate equity investments | Net lease venture
Schedule of Equity Method Investments [Line Items]
Equity method investments, carrying value	132,103		121,139
Earnings (losses) from equity method investments	2,084	981
Real estate equity investments | Safety, Income and Growth, Inc.
Schedule of Equity Method Investments [Line Items]
Equity method investments, carrying value	146,991		83,868
Earnings (losses) from equity method investments	1,472	0
Real estate equity investments | Marina Palms
Schedule of Equity Method Investments [Line Items]
Equity method investments, carrying value	4,670		2,555
Earnings (losses) from equity method investments	1,489	3,117
Real estate equity investments | Other real estate equity investments
Schedule of Equity Method Investments [Line Items]
Equity method investments, carrying value	126,855		$ 100,061
Earnings (losses) from equity method investments	$ (1,219)	$ 1,357

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(12))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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-Section 45
-Paragraph 28
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-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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-Name Accounting Standards Codification
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