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Real Estate (Acquisitions) (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2017 lease property | Sep. 30, 2017 USD ($) lease | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) lease_asset property | Dec. 31, 2015 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |
Number of net lease assets | lease_asset |  |  |  | 1 |
Acquisitions of real estate assets |  |  | $ 6,600 | $ 38,433 | $ 0
Payments for land and funded tenant improvements |  |  |  | $ 3,900 |
Number of properties acquired | property |  |  |  | 2 |
Net Lease Asset |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Acquisitions of real estate assets |  |  | $ 6,600 | $ 32,700 |
Fair value in excess of carrying value |  | $ 1,500 |  |  |
Operating leases, term |  |  |  | 99 years |
Real Estate Acquired in Satisfaction of Debt |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Fair value of assets acquired |  |  |  | $ 13,400 |
Ground Net Lease Business | Safety, Income and Growth, Inc. |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of net lease assets | lease | 7 |  |  |  |
Number of properties acquired | property | 12 |  |  |  |
Master Lease |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of leases modified | lease |  | 2 |  |  |

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- Definition The fair value of assets acquired in noncash investing or financing activities. + References 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=98513485&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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