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Schedule III - Real Estate and Accumulated Depreciation and Amortization - Notes to Schedule III (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Land, buildings, and leasehold interests: |  |  |
Balance at the beginning of year | $ 7,314,132 | $ 6,647,597 | $ 5,913,547
Acquisitions, completed construction and tenant improvements | 706,903 | 744,577 | 833,764
Disposition of land, buildings, and leasehold interests | (109,590) | (73,089) | (91,818)
Provision for loss on impairment of real estate | (27,812) | (4,953) | (7,896)
Balance at the close of year | 7,883,633 | 7,314,132 | 6,647,597
Accumulated depreciation and amortization: |  |  |
Balance at the beginning of year | 881,121 | 742,467 | 624,607
Disposition of land, buildings, and leasehold interests | (28,076) | (14,035) | (16,286)
Depreciation and amortization expense | 163,226 | 152,689 | 134,146
Balance at the close of year | 1,016,271 | 881,121 | 742,467
Work in progress - improvements | 8,017 | 41,920 | $ 24,057
Mortgages payable, including unamortized premium and net of unamortized debt costs | 12,694 | $ 13,300 |
Mortgage Agreement |  |  |
Accumulated depreciation and amortization: |  |  |
Mortgages payable, including unamortized premium and net of unamortized debt costs | 15,151 |  |
Operating Lease |  |  |
Land, buildings, and leasehold interests: |  |  |
Balance at the close of year | 7,855,114 |  |
Accumulated depreciation and amortization: |  |  |
Balance at the close of year | 1,009,374 |  |
Real estate, federal income tax basis | 7,764,828 |  |
Direct Financing Lease |  |  |
Land, buildings, and leasehold interests: |  |  |
Balance at the close of year | 0 |  |
Accumulated depreciation and amortization: |  |  |
Balance at the close of year | 0 |  |
Real estate, federal income tax basis | $ 2,703 |  |

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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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