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Investments in Real Estate and Real Estate Under Construction - Schedule of Net Real Estate (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |  |
Buildings and building improvements |  | $ 3,032,457 | $ 2,895,585
Land, land estates and land improvements |  | 743,125 | 755,168
Fixtures and equipment |  | 5,577 | 5,861
Construction in progress |  | 8,552 | 14,946
Real estate - intangible assets |  | 692,778 | 705,566
Investments in real estate under construction |  | 95,402 | 106,238
Real estate, gross |  | 4,577,891 | 4,483,364
Accumulated depreciation and amortization | [1] | (1,179,969) | (1,196,114)
Real estate, net |  | 3,397,922 | 3,287,250
Accumulated amortization |  | 367,762 | 400,628
Amortization expense, next 12 months |  | 34,418 |
Amortization expense, year 2 |  | 30,561 |
Amortization expense, year 3 |  | 26,215 |
Amortization expense, year 4 |  | 20,943 |
Amortization expense, year 5 |  | 16,722 |
Leases, Acquired-in-Place [Member] |  |  |
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |  |
Real estate - intangible assets |  | 513,564 | 473,377
Tenant Relationships [Member] |  |  |
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |  |
Real estate - intangible assets |  | 123,796 | 133,796
Above Market Leases [Member] |  |  |
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |  |
Real estate - intangible assets |  | $ 55,418 | $ 98,393
[1] | Includes accumulated amortization of real estate intangible assets of $367,762 and $400,628 in 2015 and 2014, respectively. The estimated amortization of the above real estate intangible assets for the next five years is $34,418 in 2016, $30,561 in 2017, $26,215 in 2018, $20,943 in 2019 and $16,722 in 2020.

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- Definition Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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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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