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Summary of Significant Accounting Policies Revenues and Tenant and Other Receivables (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) ft² | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jan. 01, 2019 USD ($)
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Management, transaction, and other fees |  | $ 26,501 | $ 29,636 | $ 28,494 |
Tenant and other receivables |  | 143,633 | 169,337 |  |
Lease liabilities |  | 220,390 | 222,918 |  | $ 225,400
Right of use assets, net |  | 287,827 | 292,786 |  | $ 297,800
Management, transaction, and other fee [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Tenant and other receivables |  | 9,900 | 11,600 |  |
Property management services [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Management, transaction, and other fees |  | 14,444 | 14,744 | 14,663 |
Asset management services [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Management, transaction, and other fees |  | 6,963 | 7,135 | 7,213 |
Leasing services [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Management, transaction, and other fees |  | 3,150 | 3,692 | 4,044 |
Other transaction fees [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Management, transaction, and other fees |  | 1,944 | 4,065 | 2,574 |
Accounting Standards Update 2017-05 [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  | $ 30,900 |
Tenant Receivables [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Accounts and Notes Receivable, Net |  | 39,658 | 35,526 |  |
Straight-line Rent Receivables [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Accounts and Notes Receivable, Net |  | 86,615 | 107,087 |  |
Other Receivable [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Accounts and Notes Receivable, Net | [1] | 17,360 | 26,724 |  |
Parent Company [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Accounts and Notes Receivable, Net |  | $ 143,633 | $ 169,337 |  |
COVID-19 [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Number of rent deferrals |  | 1,600 |  |  |
Deferred rent period |  | 3.3 months |  |  |
Deferred rent repayment period |  | 9.7 months |  |  |
Deferred rent receivables |  | $ 40,800 |  |  |
Deferred rent on pro rata |  | 4.6 |  |  |
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 10,000 sqft [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 |  |  |
[1] | Other receivables include construction receivables, insurance receivables, and amounts due from real estate partnerships for Management, transaction and other fee income.

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