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Real Estate (Acquisitions) (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2017 property | Sep. 30, 2017 USD ($) lease | Dec. 31, 2018 USD ($) lease_asset | Dec. 31, 2017 USD ($) lease_asset | Dec. 31, 2016 USD ($) lease_asset property
Real Estate Properties [Line Items] |  |  |  |  |
Number of net lease assets | lease_asset |  |  | 2 | 1 | 1
Acquisitions of real estate assets |  |  | $ 19,454 | $ 6,600 | $ 38,433
Payments for land and funded tenant improvements |  |  |  |  | $ 3,900
Number of properties | property |  |  |  |  | 2
Net Lease Asset |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Acquisitions of real estate assets |  |  | $ 14,800 | $ 6,600 | $ 32,700
Fair value in excess of carrying value |  | $ 1,500 |  |  |
Operating leases, term (in years) |  |  |  |  | 99 years
Ground Net Lease Business | Safety, Income and Growth, Inc. |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of properties | property | 12 |  |  |  |
Master Lease |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of leases modified | lease |  | 2 |  |  |

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- Definition Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888428&loc=SL77919359-209981 + Details
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- Definition The cash outflow from the acquisition of real estate intended to generate income for the owner; excludes land 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=109223946&loc=d3e3213-108585 + Details
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