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Operating Leases - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) property state | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Lessor, Lease, Description [Line Items] |  |  |
Number of properties owned | 6,592 |  |
Number of U.S. states where properties are owned (states) | state | 49 |  |
Percentage rent received | $ | $ 5.1 | $ 8.0 | $ 5.9
Single-client properties |  |  |
Lessor, Lease, Description [Line Items] |  |  |
Number of properties owned | 6,555 |  |
Single-client properties as percentage of total properties (as a percent) | 99.40% |  |
Properties available for lease or sale |  |  |
Lessor, Lease, Description [Line Items] |  |  |
Number of properties owned | 140 |  |

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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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- Definition Amount of operating lease income from variable lease payments paid and payable to lessor, excluding amount included in measurement of lease receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 6A -URI http://asc.fasb.org/extlink&oid=121640914&loc=SL77927221-108306 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919372-209981 + Details
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