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Investments in Real Estate and Real Estate Under Construction - Schedule of Net Real Estate (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |
Buildings and building improvements | $ 3,476,022 | $ 3,050,082
Land, land estates and land improvements | 456,134 | 472,394
Fixtures and equipment | 84 | 5,577
Construction in progress | 4,219 | 5,119
Real estate - intangible assets | 599,091 | 597,294
Investments in real estate under construction | 0 | 106,652
Real estate, gross | 4,535,550 | 4,237,118
Accumulated depreciation and amortization | (1,225,650) | (1,208,792)
Real estate, net | 3,309,900 | 3,028,326
Accumulated amortization | 334,681 | 363,861
Amortization expense, next 12 months | 31,401 |
Amortization expense, year 2 | 26,578 |
Amortization expense, year 3 | 23,360 |
Amortization expense, year 4 | 22,211 |
Amortization expense, year 5 | 20,951 |
Leases, Acquired-in-Place [Member] |  |
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |
Real estate - intangible assets | 461,624 | 436,185
Customer Relationships [Member] |  |
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |
Real estate - intangible assets | 97,223 | 113,839
Above Market Leases [Member] |  |
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |
Real estate - intangible assets | 40,244 | 47,270
LCIF [Member] |  |
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |
Buildings and building improvements | 705,565 | 644,173
Land, land estates and land improvements | 88,589 | 86,120
Fixtures and equipment | 84 | 84
Construction in progress | 4 | 825
Real estate - intangible assets | 116,861 | 104,761
Investments in real estate under construction | 0 | 40,443
Real estate, gross | 911,103 | 876,406
Accumulated depreciation and amortization | (233,121) | (236,930)
Real estate, net | 677,982 | 639,476
Accumulated amortization | 54,745 | 54,425
Amortization expense, next 12 months | 5,307 |
Amortization expense, year 2 | 4,557 |
Amortization expense, year 3 | 4,445 |
Amortization expense, year 4 | 4,431 |
Amortization expense, year 5 | 4,431 |
LCIF [Member] | Leases, Acquired-in-Place [Member] |  |
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |
Real estate - intangible assets | 95,166 | 82,190
LCIF [Member] | Customer Relationships [Member] |  |
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |
Real estate - intangible assets | 19,067 | 19,943
LCIF [Member] | Above Market Leases [Member] |  |
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |
Real estate - intangible assets | $ 2,628 | $ 2,628

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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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