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Real Estate (Acquisitions) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) property	Dec. 31, 2013 USD ($) property
Real Estate Properties [Line Items]
Acquisitions of real estate assets	$ 0	$ 4,666	$ 102,364
Real Estate Acquired in Satisfaction of Debt
Real Estate Properties [Line Items]
Fair value of assets acquired	13,400
Real Estate Acquired in Satisfaction of Debt | Corporate Joint Venture
Real Estate Properties [Line Items]
Fair value of assets acquired			$ 25,500
Consolidated entity, ownership percentage			63.00%
Noncontrolling interest, ownership percentage by noncontrolling owners			37.00%
Real Estate Acquired in Satisfaction of Debt | Commercial Operating Properties
Real Estate Properties [Line Items]
Number of properties acquired | property		3
Fair value of assets acquired		$ 72,400
Operating Properties
Real Estate Properties [Line Items]
Acquisitions of real estate assets		1,700
Net proceeds from sales of real estate	93,500
Condominium Units
Real Estate Properties [Line Items]
Acquisitions of real estate assets		$ 3,000
Number of properties acquired | property		2
Land
Real Estate Properties [Line Items]
Property sold, aggregate, carrying value			$ 14,800
Number of properties acquired | property		1
Land | Real Estate Acquired in Satisfaction of Debt
Real Estate Properties [Line Items]
Number of real estate properties acquired | property			2
Net Lease Asset One
Real Estate Properties [Line Items]
Acquisitions of real estate assets			$ 93,600
Finite-lived intangible assets acquired			36,100
Below market lease			11,900
Transaction costs			200
Net proceeds from sales of real estate		$ 7,800
Net Lease Asset One | iStar Net Lease I LLC
Real Estate Properties [Line Items]
Net proceeds from sales of real estate		93,700
Commercial Operating Properties
Real Estate Properties [Line Items]
Property sold, aggregate, carrying value		$ 29,400	$ 72,600
Operating Properties
Real Estate Properties [Line Items]
Property sold, aggregate, carrying value	$ 5,300

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

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-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586

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