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Organization and Principles of Consolidation Revenues and Tenant and Other Receivables (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) ft² | Sep. 30, 2018 USD ($) | Jan. 01, 2019 USD ($) | Dec. 31, 2018 USD ($)
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |  |
Lease liabilities | $ 223,581 |  | $ 223,581 |  | $ 225,400 | $ 0
Right of use assets, net | 294,051 |  | 294,051 |  | $ 297,800 | 0
Other property income | 2,780 | $ 2,408 | 6,956 | $ 6,755 |  |
Management, transaction, and other fees | 7,353 | 6,954 | 21,768 | 20,999 |  |
Tenant and other receivables | 161,381 |  | 161,381 |  |  | 172,359
Management, transaction, and other fee [Member] |  |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |  |
Tenant and other receivables | 11,100 |  | 11,100 |  |  | $ 12,500
Property management services [Member] |  |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |  |
Management, transaction, and other fees | 3,648 | 3,588 | 11,076 | 11,008 |  |
Asset management services [Member] |  |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |  |
Management, transaction, and other fees | 1,803 | 1,840 | 5,341 | 5,347 |  |
Leasing services [Member] |  |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |  |
Management, transaction, and other fees | 1,239 | 969 | 2,702 | 2,726 |  |
Other transaction fees [Member] |  |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |  |
Management, transaction, and other fees | $ 663 | $ 557 | $ 2,649 | $ 1,918 |  |
Leases less than 10,000 sqft [Member] |  |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |  |
Operating leases, tenant space terms | ft² |  |  | 10,000 |  |  |
Leases greater then 10,000sqft [Member] |  |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |  |
Operating leases, tenant space terms | ft² |  |  | 10,000 |  |  |
Minimum [Member] |  |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |  |
Operating leases, lease year range |  |  | 3 years |  |  |
Operating leases, lease year range for tenant space greater than 10,000 sq ft |  |  | 5 years |  |  |
Maximum [Member] |  |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |  |
Operating leases, lease year range |  |  | 7 years |  |  |

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