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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] |  |  |
Balance at the beginning of year | $ 6,647,597 | $ 5,913,547 | $ 5,236,251
Acquisitions, completed construction and tenant improvements | 744,577 | 833,764 | 717,899
Disposition of land, buildings, and leasehold interests | (73,089) | (91,818) | (36,633)
Provision for loss on impairment of real estate | (4,953) | (7,896) | (3,970)
Balance at the close of year | 7,314,132 | 6,647,597 | 5,913,547
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |
Balance at the beginning of year | 742,467 | 624,607 | 513,175
Disposition of land, buildings, and leasehold interests | (14,035) | (16,286) | (7,377)
Depreciation and amortization expense | 152,689 | 134,146 | 118,809
Balance at the close of year | 881,121 | 742,467 | 624,607
Work in progress - improvements | 41,920 | 24,057 | $ 61,354
Mortgages payable, including unamortized premium and net of unamortized debt costs | 13,300 | $ 13,878 |
Operating Lease |  |  |
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] |  |  |
Balance at the close of year | 7,267,243 |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |
Balance at the close of year | 880,235 |  |
Real estate, federal income tax basis | 7,201,219 |  |
Direct Financing Lease |  |  |
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] |  |  |
Balance at the close of year | 0 |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |
Balance at the close of year | 0 |  |
Real estate, federal income tax basis | 2,703 |  |
Mortgage Agreement |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |
Mortgages payable, including unamortized premium and net of unamortized debt costs | $ 15,151 |  |

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- Definition The current amount of expenditures for a real estate project that has not yet been completed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.FN4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 + Details
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- Definition Amount of decrease to accumulated depreciation for real estate investments sold for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.FN4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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