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Intangible Assets and Below Market Lease Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Assets: |  |  |  |  |
Deferred leasing costs (including lease incentives and above market lease and in-place lease acquisition-related intangible assets) | $ 341,384 |  | $ 341,384 |  | $ 344,191
Deferred leasing costs, accumulated amortization | (147,588) |  | (147,588) |  | (143,512)
Deferred leasing costs, net/Total scheduled future amortization of intangible assets | 193,796 |  | 193,796 |  | 200,679
Liabilities (in accounts payable, accrued expenses and other liabilities): |  |  |  |  |
Acquisition-related below market lease liabilities, gross | 58,698 |  | 58,698 |  | 59,947
Acquisition-related below market lease liabilities, accumulated amortization | (31,519) |  | (31,519) |  | (28,214)
Acquisition-related below market lease liabilities, net | 27,179 |  | 27,179 |  | $ 31,733
Deferred Leasing Costs and Acquisition-Related Intangible Assets (in Depreciation and Amortization) [Member] |  |  |  |  |
Assets: |  |  |  |  |
Deferred leasing costs, net/Total scheduled future amortization of intangible assets | 176,652 |  | 176,652 |  |
Amortization of intangible assets and below market lease liabilities [Abstract] |  |  |  |  |
Amortization of intangible assets | 8,969 | $ 10,130 | 27,671 | $ 30,882 |
Lease Incentives (in Rental and Other Revenues) [Member] |  |  |  |  |
Assets: |  |  |  |  |
Deferred leasing costs, net/Total scheduled future amortization of intangible assets | 10,834 |  | 10,834 |  |
Amortization of intangible assets and below market lease liabilities [Abstract] |  |  |  |  |
Amortization of intangible assets | 452 | 444 | 1,357 | 1,284 |
Acquisition-Related Intangible Assets (in Rental and Other Revenues) [Member] |  |  |  |  |
Assets: |  |  |  |  |
Deferred leasing costs, net/Total scheduled future amortization of intangible assets | 5,103 |  | 5,103 |  |
Amortization of intangible assets and below market lease liabilities [Abstract] |  |  |  |  |
Amortization of intangible assets | 415 | 671 | 1,292 | 2,382 |
Acquisition-Related Intangible Assets (in Rental Property and Other Expenses) [Member] |  |  |  |  |
Assets: |  |  |  |  |
Deferred leasing costs, net/Total scheduled future amortization of intangible assets | 1,207 |  | 1,207 |  |
Amortization of intangible assets and below market lease liabilities [Abstract] |  |  |  |  |
Amortization of intangible assets | 140 | 140 | 416 | 416 |
Acquisition-Related Below Market Lease Liabilities (in Rental and Other Revenues) [Member] |  |  |  |  |
Liabilities (in accounts payable, accrued expenses and other liabilities): |  |  |  |  |
Acquisition-related below market lease liabilities, net | 27,179 |  | 27,179 |  |
Amortization of intangible assets and below market lease liabilities [Abstract] |  |  |  |  |
Amortization of acquisition-related below market lease liabilities | $ (1,535) | $ (1,576) | $ (4,553) | $ (4,748) |

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