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Other Investments (Schedule of Other Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Equity method investments, carrying value	$ 276,821		$ 276,821		$ 214,406
Earnings from equity method investments	5,515	$ 39,447	11,217	$ 47,714
Other strategic investments
Schedule of Equity Method Investments [Line Items]
Equity method investments, carrying value	27,239		27,239		33,350
Earnings from equity method investments	360	4,723	607	5,525
Oak Hill Funds
Schedule of Equity Method Investments [Line Items]
Earnings from equity method investments		500		3,700
Real estate equity investments
Schedule of Equity Method Investments [Line Items]
Equity method investments, carrying value	249,582		249,582		181,056
Earnings from equity method investments	5,155	34,724	10,610	42,189
Real estate equity investments | Net lease venture
Schedule of Equity Method Investments [Line Items]
Equity method investments, carrying value	128,997		128,997		92,669
Earnings from equity method investments	1,032	944	2,013	1,890
Real estate equity investments | Safety, Income and Growth, Inc.
Schedule of Equity Method Investments [Line Items]
Equity method investments, carrying value	50,287		50,287		0
Earnings from equity method investments		0	48	0
Real estate equity investments | Marina Palms
Schedule of Equity Method Investments [Line Items]
Equity method investments, carrying value	7,191		7,191		35,185
Earnings from equity method investments	1,183	5,180	4,300	13,401
Real estate equity investments | Other real estate equity investments
Schedule of Equity Method Investments [Line Items]
Equity method investments, carrying value	63,107		63,107		$ 53,202
Earnings from equity method investments	$ 2,892	$ 28,600	$ 4,249	$ 26,898

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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
-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Topic 323
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-Name Accounting Standards Codification
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