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Real Estate Investment in Real Estate - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Land | $ 5,899,862 | $ 5,864,046 |
Depreciable property [Abstract] |  |  |
Buildings and improvements | 16,913,430 | 16,346,829 |
Furniture, fixtures and equipment | 1,346,300 | 1,207,098 |
Finite-Lived Intangible Asset, Acquired-in-Place Leases | 470,849 | 483,160 |
Projects under development [Abstract] |  |  |
Construction-in-progress | 637,168 | 1,122,376 |
Land held for development [Abstract] |  |  |
Land held for development | 118,816 | 158,843 |
Construction-in-progress | 637,168 | 1,122,376 |
Investment in real estate | 25,386,425 | 25,182,352 |
Accumulated depreciation | (5,360,389) | (4,905,406) |
Investment in real estate, net | 20,026,036 | 20,276,946 |
Amortization of above/below market leases | 3,426 | 3,382 | $ 3,222
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 3,781 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 4,250 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 4,250 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 4,250 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 4,254 |  |
Assets [Member] |  |  |
Land held for development [Abstract] |  |  |
Below Market Lease, Gross | 178,251 | 178,251 |
Finite-Lived Intangible Asset, Off-market Lease, Favorable, Gross | 1,260 | 1,260 |
Lease intangible assets | 179,511 | 179,511 |
Finite-Lived Intangible Assets, Accumulated Amortization | (17,972) | (13,451) |
Finite-Lived Intangible Assets, Net | 161,539 | 166,060 |
Liability [Member] |  |  |
Land held for development [Abstract] |  |  |
Below Market Lease, Gross | 5,270 | 5,270 |
Ground lease intangibles – above market | 2,400 | 2,400 |
Lease Intangible Liabilities | 7,670 | 7,670 |
Finite Lived Intangible Liabilities Accumulated Amortization | (4,509) | (3,414) |
Lease Intangible Liabilities, net | 3,161 | 4,256 |
Ground Lease [Member] |  |  |
Land held for development [Abstract] |  |  |
Amortization of above/below market leases | 4,300 | 4,300 | 4,300
Finite-lived Intangible Assets; Amortization Exp, Next Twelve Months | 4,321 |  |
Finite-lived Intangible Assets; Amortization Exp, Year 2 | 4,321 |  |
Finite-lived Intangible Assets; Amortization Exp, Year 3 | 4,321 |  |
Finite-lived Intangible Assets; Amortization Exp, Year 4 | 4,321 |  |
Finite-lived Intangible Assets; Amortization Exp, Year 5 | 4,321 |  |
Retail Site [Member] |  |  |
Land held for development [Abstract] |  |  |
Amortization of above/below market leases | 900 | 900 | $ 1,100
Finite-lived Intangible Assets; Amortization Exp, Next Twelve Months | (540) |  |
Finite-lived Intangible Assets; Amortization Exp, Year 2 | (71) |  |
Finite-lived Intangible Assets; Amortization Exp, Year 3 | (71) |  |
Finite-lived Intangible Assets; Amortization Exp, Year 4 | (71) |  |
Finite-lived Intangible Assets; Amortization Exp, Year 5 | (67) |  |
Projects under development [Member] |  |  |
Projects under development [Abstract] |  |  |
Land Under Development | 115,876 | 284,995 |
Construction-in-progress | 521,292 | 837,381 |
Land held for development [Abstract] |  |  |
Construction-in-progress | 521,292 | 837,381 |
Land held for development [Member] |  |  |
Projects under development [Abstract] |  |  |
Construction-in-progress | 34,376 | 38,836 |
Land held for development [Abstract] |  |  |
Land held for development | 84,440 | 120,007 |
Construction-in-progress | $ 34,376 | $ 38,836 |

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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 This element represents the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property. Such amount may include the value assigned to existing tenant relationships and excludes the market adjustment component of the value assigned for above or below-market leases acquired. + References No definition available. + Details
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- Definition Aggregate of the carrying amounts as of the balance sheet date of investments in building and building improvements. + 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 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + 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 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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