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Schedule III - Real Estate and Accumulated Depreciation and Amortization - Real Estate - Held for Sale (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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 | $ 7,883,633 | $ 7,314,132 | $ 6,647,597 | $ 5,913,547
Accumulated Depreciation and Amortization | 1,016,271 | $ 881,121 | $ 742,467 | $ 624,607
Assets Held-for-sale |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 |  |  |
Initial Cost to Company, Land | 10,837 |  |  |
Initial Cost to Company, Building, Improvements & Leasehold Interests | 25,467 |  |  |
Costs Capitalized Subsequent to Acquisition, Improvements | 680 |  |  |
Costs Capitalized Subsequent to Acquisition, Carrying Costs |  |  |  |
Gross Amount at Which Carried at Close of Period, Land | 8,606 |  |  |
Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 11,897 |  |  |
Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 20,503 |  |  |
Accumulated Depreciation and Amortization | 6,897 |  |  |
Assets Held-for-sale | Amazing Jakes Plano Tx [Member] |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | 0 |  |  |
Initial Cost to Company, Land | 5,705 |  |  |
Initial Cost to Company, Building, Improvements & Leasehold Interests | 17,049 |  |  |
Costs Capitalized Subsequent to Acquisition, Improvements | 18 |  |  |
Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 |  |  |
Gross Amount at Which Carried at Close of Period, Land | 5,706 |  |  |
Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 6,639 |  |  |
Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 12,345 |  |  |
Accumulated Depreciation and Amortization | $ 5,098 |  |  |
Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 35 years |  |  |
Assets Held-for-sale | Chipotle Hadley Ma [Member] |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | $ 0 |  |  |
Initial Cost to Company, Land | 45 |  |  |
Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 |  |  |
Costs Capitalized Subsequent to Acquisition, Improvements | 0 |  |  |
Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 |  |  |
Gross Amount at Which Carried at Close of Period, Land | 632 |  |  |
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 | $ 632 |  |  |
Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 0 years |  |  |
Assets Held-for-sale | Gander Mountain Eau Claire Wi [Member] |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | $ 0 |  |  |
Initial Cost to Company, Land | 2,263 |  |  |
Initial Cost to Company, Building, Improvements & Leasehold Interests | 8,418 |  |  |
Costs Capitalized Subsequent to Acquisition, Improvements | 662 |  |  |
Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 |  |  |
Gross Amount at Which Carried at Close of Period, Land | 2,263 |  |  |
Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 5,258 |  |  |
Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 7,521 |  |  |
Accumulated Depreciation and Amortization | $ 1,799 |  |  |
Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 35 years |  |  |
Assets Held-for-sale | Vacant Land Hadley Ma [Member] |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Encumbrances | $ 0 |  |  |
Initial Cost to Company, Land | 2,824 |  |  |
Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 |  |  |
Costs Capitalized Subsequent to Acquisition, Improvements | 0 |  |  |
Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 |  |  |
Gross Amount at Which Carried at Close of Period, Land | 5 |  |  |
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 | $ 5 |  |  |
Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 0 years |  |  |

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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 accumulated depreciation pertaining to real estate investments 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 F)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition Amount before accumulated depreciation of buildings and improvements for entities with a substantial portion of business acquiring and holding investment real estate. Excludes real estate not held as an investment or interest. + 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 E)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition Amount of land for entities with a substantial portion of business acquiring and holding investment real estate. Excludes real estate not held as an investment or interest. + 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 E)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition Amount of cost capitalized subsequent to acquisition for real estate investment property, including, but not limited to, real estate tax and insurance, by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. Excludes initial purchase price and improvement, and real estate not held as investment or interest. + 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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- 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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- Definition Useful life on which depreciation was computed for entities with a substantial portion of business acquiring and holding investment real estate, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 I)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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