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Schedule III Real Estate and Accumulated Depreciation - Summary of Activity (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) property | Dec. 31, 2017 USD ($) property | Dec. 31, 2016 USD ($) property
Reconciliation of total real estate carrying value for the years ended: |  |  |
Balance at Beginning of Period | $ 15,027,043,415 | $ 13,904,519,436 | $ 12,310,846,785
Acquisitions | 1,802,745,841 | 1,531,960,811 | 1,857,783,837
Less amounts allocated to acquired lease intangible assets and liabilities on our Consolidated Balance Sheets | (89,474,897) | (238,556,294) | (139,341,205)
Improvements, Etc. | 23,043,158 | 11,067,322 | 16,405,486
Other (Leasing Costs and Building Adjustments as a result of net debt premiums) | 2,839,574 | 1,584,152 | 1,495,439
Total Additions | 1,739,153,676 | 1,306,055,991 | 1,736,343,557
Cost of Real Estate sold or disposed of | 165,023,825 | 150,394,756 | 118,792,948
Cost of Equipment sold | 15,650 | 0 | 0
Releasing costs | 232,089 | 109,986 | 418,772
Other (including Provisions for Impairment) | 34,323,541 | 33,027,270 | 23,459,186
Total Deductions | 199,595,105 | 183,532,012 | 142,670,906
Balance at Close of Period | 16,566,601,986 | 15,027,043,415 | 13,904,519,436
Reconciliation of accumulated depreciation for the years ended: |  |  |
Balance at Beginning of Period | 2,350,544,126 | 2,000,728,517 | 1,691,963,148
Additions During Period - Provision for Depreciation | 432,482,396 | 393,415,491 | 355,030,226
Deductions During Period: Accumulated depreciation of real estate and equipment sold or disposed of | 59,941,232 | 43,599,882 | 46,264,857
Balance at Close of Period | $ 2,723,085,290 | $ 2,350,544,126 | $ 2,000,728,517
Number of single-tenant properties | property | 5,763 |  |
Number of corporate headquarters | property | 1 |  |
Number of properties, Crest Net Lease Inc. | property | 6 |  |
Number of multi-tenant properties | property | 28 |  |
Number of properties secured by mortgages | property | 60 |  |
Unamortized debt premium | $ 4,400,000 |  |
Aggregate cost for federal income tax purposes | 16,597,514,084 |  |
Aggregate cost for federal income tax purposes, Crest Net Lease Inc | $ 7,839,284 |  |
Number of properties on which provisions for impairment were recorded | property | 45 | 26 | 39
Adjustments to estimated legal obligations related to asset retirement obligations | $ 8,297 | $ 9,774 | $ 6,525
Number of buildings with adjustments recorded to estimated legal obligations related to asset retirement obligations | property | 2 | 2 | 2

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- Definition Represents the number of multi-tenant real estate properties owned as of the balance sheet date. + References No definition available. + Details
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- Definition Represents the number of real estate properties secured by mortgages. + References No definition available. + Details
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- Definition Number of Buildings With Related Asset Retirement Obligations + References No definition available. + Details
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- Definition Represents the amount of real estate investments acquired allocated to intangible assets that are included in Other Assets on the Consolidated Balance Sheets. + References No definition available. + Details
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- Definition Represents the carrying amount of equipment sold during the period. + References No definition available. + Details
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- Definition Represents the amount of decrease to real estate investments during the period. + References No definition available. + Details
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- Definition Cost basis of real estate investments for federal income tax purposes 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 -Footnote 6 -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(Footnote 6)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition Amount, before accumulated depreciation, of real estate investment by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. Excludes 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 E)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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