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Intangible Assets and Below Market Lease Liabilities - Scheduled Future Amortization (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Scheduled future amortization of intangible assets [Abstract] |  |
Deferred leasing costs, net/Total scheduled future amortization of intangible assets | $ 193,796 | $ 200,679
Scheduled future amortization of below market lease liabilities [Abstract] |  |
Total scheduled future amortization of acquisition-related below market lease liabilities | (27,179) | $ (31,733)
Deferred Leasing Costs and Acquisition-Related Intangible Assets (in Depreciation and Amortization) [Member] |  |
Scheduled future amortization of intangible assets [Abstract] |  |
October 1 through December 31, 2018 | 9,395 |
2019 | 34,011 |
2020 | 29,391 |
2021 | 24,873 |
2022 | 20,584 |
Thereafter | 58,398 |
Deferred leasing costs, net/Total scheduled future amortization of intangible assets | $ 176,652 |
Weighted average remaining amortization periods for intangible assets and below market lease liabilities [Abstract] |  |
Finite-lived intangible assets, average useful life (in years) | 7 years 4 months 25 days |
Lease Incentives (in Rental and Other Revenues) [Member] |  |
Scheduled future amortization of intangible assets [Abstract] |  |
October 1 through December 31, 2018 | $ 453 |
2019 | 1,647 |
2020 | 1,360 |
2021 | 1,132 |
2022 | 915 |
Thereafter | 5,327 |
Deferred leasing costs, net/Total scheduled future amortization of intangible assets | $ 10,834 |
Weighted average remaining amortization periods for intangible assets and below market lease liabilities [Abstract] |  |
Finite-lived intangible assets, average useful life (in years) | 10 years 1 month 5 days |
Acquisition-Related Intangible Assets (in Rental and Other Revenues) [Member] |  |
Scheduled future amortization of intangible assets [Abstract] |  |
October 1 through December 31, 2018 | $ 369 |
2019 | 1,273 |
2020 | 959 |
2021 | 632 |
2022 | 462 |
Thereafter | 1,408 |
Deferred leasing costs, net/Total scheduled future amortization of intangible assets | $ 5,103 |
Weighted average remaining amortization periods for intangible assets and below market lease liabilities [Abstract] |  |
Finite-lived intangible assets, average useful life (in years) | 6 years 6 months |
Acquisition-Related Intangible Assets (in Rental Property and Other Expenses) [Member] |  |
Scheduled future amortization of intangible assets [Abstract] |  |
October 1 through December 31, 2018 | $ 136 |
2019 | 553 |
2020 | 518 |
2021 | 0 |
2022 | 0 |
Thereafter | 0 |
Deferred leasing costs, net/Total scheduled future amortization of intangible assets | $ 1,207 |
Weighted average remaining amortization periods for intangible assets and below market lease liabilities [Abstract] |  |
Finite-lived intangible assets, average useful life (in years) | 2 years 2 months 15 days |
Acquisition-Related Below Market Lease Liabilities (in Rental and Other Revenues) [Member] |  |
Scheduled future amortization of below market lease liabilities [Abstract] |  |
October 1 through December 31, 2018 | $ (1,442) |
2019 | (5,425) |
2020 | (5,169) |
2021 | (4,362) |
2022 | (3,258) |
Thereafter | (7,523) |
Total scheduled future amortization of acquisition-related below market lease liabilities | $ (27,179) |
Weighted average remaining amortization periods for intangible assets and below market lease liabilities [Abstract] |  |
Finite-lived below market lease liabilities, average useful life (in years) | 6 years 1 month 10 days |

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