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Real Estate (Other Dispositions) (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from sales of real estate			$ 92,049	$ 105,296	$ 93,816
Noncontrolling interest at carrying value	$ 5,031		0	5,031
Total
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sales of real estate			216,700	444,100	395,700
Income from sales of real estate			92,000	96,500	93,800
Operating Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sales of real estate			41,300	326,900	294,900
Income from sales of real estate			$ 4,500	75,400	53,700
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%
Net Lease
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sales of real estate			$ 175,400	117,200	$ 100,800
Income from sales of real estate			87,500	$ 21,100	40,100
Net Lease Asset
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from sales of real estate			62,500
Noncontrolling interest at carrying value			3,500
Payments for repurchase of redeemable noncontrolling interest			$ 12,000
Operating Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sales of real estate					93,500
Payments for repurchase of redeemable noncontrolling interest		$ 6,400
Property sold, aggregate, carrying value					$ 126,300
Operating leases, term					99 years
Other finite-lived intangible assets		$ 32,800			$ 32,800
Operating Properties | RCC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from sales of real estate					13,600
Sales price of real estate held for investment					$ 68,500
iStar's ownership percentage		50.00%			50.00%

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
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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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Amount before accumulated amortization of finite-lived intangible assets classified as other.

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The cash outflow during the period for redemption of redeemable noncontrolling interests.

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Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

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As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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