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Intangible Assets and Below Market Lease Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Intangible assets and below market lease liabilities, net [Abstract] |  |  |  |  |
Deferred leasing costs (including lease incentives and above market lease and in-place lease acquisition-related intangible assets) | $ 346,294 |  | $ 346,294 |  | $ 346,937
Deferred leasing costs, accumulated amortization | (129,252) |  | (129,252) |  | (115,172)
Deferred leasing costs, net/Total scheduled future amortization of intangible assets | 217,042 |  | 217,042 |  | 231,765
Acquisition-related below market lease liabilities, gross | 63,400 |  | 63,400 |  | 63,830
Acquisition-related below market lease liabilities, accumulated amortization | (22,057) |  | (22,057) |  | (17,927)
Acquisition-related below market lease liabilities, net | 41,343 |  | 41,343 |  | $ 45,903
Deferred Leasing Costs and Acquisition-Related Intangible Assets [Member] |  |  |  |  |
Intangible assets and below market lease liabilities, net [Abstract] |  |  |  |  |
Deferred leasing costs, net/Total scheduled future amortization of intangible assets | 196,408 |  | 196,408 |  |
Amortization of intangible assets and below market lease liabilities [Abstract] |  |  |  |  |
Amortization of intangible assets | 11,731 | $ 9,888 | 23,066 | $ 19,889 |
Lease Incentives [Member] |  |  |  |  |
Intangible assets and below market lease liabilities, net [Abstract] |  |  |  |  |
Deferred leasing costs, net/Total scheduled future amortization of intangible assets | 7,131 |  | 7,131 |  |
Amortization of intangible assets and below market lease liabilities [Abstract] |  |  |  |  |
Amortization of intangible assets | 390 | 412 | 1,101 | 763 |
Acquisition-Related Intangible Assets (in Rental and Other Revenues) [Member] |  |  |  |  |
Intangible assets and below market lease liabilities, net [Abstract] |  |  |  |  |
Deferred leasing costs, net/Total scheduled future amortization of intangible assets | 11,043 |  | 11,043 |  |
Amortization of intangible assets and below market lease liabilities [Abstract] |  |  |  |  |
Amortization of intangible assets | 972 | 1,189 | 2,003 | 2,355 |
Acquisition-Related Intangible Assets (in Rental Property and Other Expenses) [Member] |  |  |  |  |
Intangible assets and below market lease liabilities, net [Abstract] |  |  |  |  |
Deferred leasing costs, net/Total scheduled future amortization of intangible assets | 2,460 |  | 2,460 |  |
Amortization of intangible assets and below market lease liabilities [Abstract] |  |  |  |  |
Amortization of intangible assets | 139 | 139 | 277 | 276 |
Acquisition-Related Below Market Lease Liabilities [Member] |  |  |  |  |
Intangible assets and below market lease liabilities, net [Abstract] |  |  |  |  |
Acquisition-related below market lease liabilities, net | 41,343 |  | 41,343 |  |
Amortization of intangible assets and below market lease liabilities [Abstract] |  |  |  |  |
Amortization of acquisition-related below market lease liabilities | $ (2,788) | $ (1,674) | $ (4,560) | $ (3,406) |

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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=66902209&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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