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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Real Estate Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items] |  |  |
Net amortization expense of acquired intangibles | $ 13,256 | $ 8,687 | $ 12,939
Future amortization expense, 2018 | 9,093 |  |
Future amortization expense, 2019 | 4,154 |  |
Future amortization expense, 2020 | 1,926 |  |
Future amortization expense, 2021 | 1,712 |  |
Future amortization expense, 2022 | 1,572 |  |
Interest expense capitalized | 2,314 | 2,182 | $ 3,697
Intangible lease assets and other assets | Above-market/Below-market leases |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible lease assets and liabilities, Cost | 38,798 | 49,310 |
Intangible lease assets and liabilities, Accumulated Amortization | (31,245) | (38,197) |
Intangible lease assets and other assets | In-place leases |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible lease assets and liabilities, Cost | 103,230 | 110,968 |
Intangible lease assets and liabilities, Accumulated Amortization | (78,854) | (80,256) |
Intangible lease assets and other assets | Tenant relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible lease assets and liabilities, Cost | 44,580 | 29,494 |
Intangible lease assets and liabilities, Accumulated Amortization | (9,719) | (6,610) |
Accounts payable and accrued liabilities | Above-market/Below-market leases |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible lease assets and liabilities, Cost | 69,990 | 87,266 |
Intangible lease assets and liabilities, Accumulated Amortization | $ (49,756) | $ (60,286) |
Buildings |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated useful life | 40 years |  |
Certain Improvements | Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated useful life | 10 years |  |
Certain Improvements | Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated useful life | 20 years |  |
Equipment and Fixtures | Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated useful life | 7 years |  |
Equipment and Fixtures | Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated useful life | 10 years |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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