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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] |  |  |
Balance at the beginning of year | $ 5,236,251 | $ 4,686,844 | $ 4,145,368
Acquisitions, completed construction and tenant improvements | 717,899 | 601,168 | 602,836
Disposition of land, buildings, and leasehold interests | (36,633) | (50,938) | (57,254)
Provision for loss on impairment of real estate | (3,970) | (823) | (4,106)
Balance at the close of year | 5,913,547 | 5,236,251 | 4,686,844
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |
Balance at the beginning of year | 513,175 | 418,136 | 333,778
Disposition of land, buildings, and leasehold interests | (7,377) | (9,153) | (6,778)
Depreciation and amortization expense | 118,809 | 104,192 | 91,136
Balance at the close of year | 624,607 | 513,175 | 418,136
Work in progress | 61,354 | 28,908 | $ 60,720
Mortgages payable, including unamortized premium and net of unamortized debt costs | 23,964 | $ 26,182 |
Operating Lease |  |  |
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] |  |  |
Balance at the close of year | 5,815,108 |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |
Balance at the close of year | 620,188 |  |
Real estate, federal income tax basis | 5,801,797 |  |
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-2 |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |
Mortgages payable, including unamortized premium and net of unamortized debt costs | 6,952 |  |
Mortgage Agreement-3 |  |  |
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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Phase -URI http://asc.fasb.org/extlink&oid=49177889 + Details
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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + 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 Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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