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Real Estate (Acquisitions) (Details) $ in Thousands	1 Months Ended			12 Months Ended
	Aug. 31, 2019	May 31, 2019 USD ($)	Feb. 28, 2019	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) lease_asset	Dec. 31, 2017 USD ($)
Real Estate Properties [Line Items]
Acquisitions of real estate assets		$ 56,700		$ 240,487	$ 19,454	$ 6,600
Number of net lease assets | lease_asset					2
Net Lease Asset
Real Estate Properties [Line Items]
Acquisitions of real estate assets				11,500	$ 14,800
Lease Hold Interest
Real Estate Properties [Line Items]
Acquisitions of real estate assets				98,200
Safehold Inc.
Real Estate Properties [Line Items]
Ground lease term (in years)	99 years		98 years
net lease asset two [Member]
Real Estate Properties [Line Items]
Acquisitions of real estate assets				$ 110,600

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Ground Leases, Term

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- Definition

The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585

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