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Schedule III - Real Estate and Accumulated Depreciation and Amortization - Under Direct Financing Leases (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | $ 8,448,702 | $ 7,883,633 | $ 7,314,132 | $ 6,647,597
Accumulated Depreciation and Amortization | 1,151,667 | $ 1,016,271 | $ 881,121 | $ 742,467
Direct Financing Lease |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 |  |  |
Initial Cost to Company, Land | 1,064 |  |  |
Initial Cost to Company, Building, Improvements & Leasehold Interests | 6,720 |  |  |
Costs Capitalized Subsequent to Acquisition, Improvements | 1,984 |  |  |
Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 |  |  |
Gross Amount at Which Carried at Close of Period, Land | 0 |  |  |
Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 0 |  |  |
Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 0 |  |  |
Accumulated Depreciation and Amortization | 0 |  |  |
Direct Financing Lease | CVS [Member] |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 |  |  |
Initial Cost to Company, Building, Improvements & Leasehold Interests | 1,365 |  |  |
Costs Capitalized Subsequent to Acquisition, Improvements | 0 |  |  |
Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 |  |  |
Direct Financing Lease | Denny's [Member] |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 |  |  |
Initial Cost to Company, Land | 940 |  |  |
Initial Cost to Company, Building, Improvements & Leasehold Interests | 509 |  |  |
Costs Capitalized Subsequent to Acquisition, Improvements | 0 |  |  |
Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 |  |  |
Direct Financing Lease | Jared Jewelers [Member] |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 |  |  |
Initial Cost to Company, Building, Improvements & Leasehold Interests | 1,503 |  |  |
Costs Capitalized Subsequent to Acquisition, Improvements | 0 |  |  |
Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 |  |  |
Direct Financing Lease | Rite Aid [Member] |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 |  |  |
Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 |  |  |
Costs Capitalized Subsequent to Acquisition, Improvements | 1,984 |  |  |
Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 |  |  |
Direct Financing Lease | Sunshine Energy [Member] |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 |  |  |
Initial Cost to Company, Land | 124 |  |  |
Initial Cost to Company, Building, Improvements & Leasehold Interests | 142 |  |  |
Costs Capitalized Subsequent to Acquisition, Improvements | 0 |  |  |
Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 |  |  |
Direct Financing Lease | Walgreens [Member] |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 |  |  |
Initial Cost to Company, Building, Improvements & Leasehold Interests | 3,201 |  |  |
Costs Capitalized Subsequent to Acquisition, Improvements | 0 |  |  |
Costs Capitalized Subsequent to Acquisition, Carrying Costs | $ 0 |  |  |

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- Definition Amount of lien or mortgage outstanding on real estate investment properties for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column B -Subsection 28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column B)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition Amount of land and buildings and improvements made to real estate investments and capitalized after acquisition for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column D)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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