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Real Estate (Dispositions) (Details) $ in Thousands	1 Months Ended		12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) property	Dec. 31, 2014 USD ($)	Feb. 28, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from sales of real estate			$ 105,296	$ 93,816	$ 89,943
Other finite-lived intangible assets	$ 32,800		$ 32,800
Noncontrolling interest, ownership percentage by parent	95.70%		95.70%
Condominium Units
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of other real estate			$ 97,800	127,900	236,200
Income from sales of real estate			26,100	40,100	79,100
Net Lease Asset Two
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from sales of real estate			21,100	40,100	6,200
Net proceeds from sales of real estate			117,200	100,800	127,200
Operating Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property sold, aggregate, carrying value				126,300
Income from sales of real estate					4,600
Net proceeds from sales of real estate				$ 93,500	34,200
Operating leases, term				99 years
Other finite-lived intangible assets		$ 32,800		$ 32,800
Payments for repurchase of redeemable noncontrolling interest		$ 6,400
Number of real estate properties sold | property				3
Operating Properties | RCC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from sales of real estate			49,300	$ 13,600
Sales price of real estate held for investment			$ 229,100	$ 68,500
iStar's ownership percentage		50.00%		50.00%
Net Lease | iStar Net Lease I LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
iStar's ownership percentage						51.90%
Net proceeds from sales of real estate					$ 10,100
Noncontrolling interest, ownership percentage by parent					72.00%
Transfer mortgage payable					$ 26,000
Operating Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property sold, aggregate, carrying value				$ 5,000
Operating Properties | RCC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from sales of real estate	$ 8,800			13,600
Sales price of real estate held for investment	$ 36,000			$ 68,500
iStar's ownership percentage	50.00%	50.00%	50.00%	50.00%
Net Lease Asset One | iStar Net Lease I LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sales of real estate					$ 93,700

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Number of Real Estate Properties Sold

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Term of the lessor's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The fair value of transfer of mortgage payable in noncash investing or financing activities.

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