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Organization and Principles of Consolidation Revenues and Tenant and Other Receivables (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Management, transaction, and other fee [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Accounts Receivable, Net | $ 9,100,000 |  | $ 9,100,000 |  |
Parent Company [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Property Management Fee Revenue | 6,887,000 | $ 6,601,000 | 14,045,000 | $ 13,307,000 |
Accounts Receivable, Net | 155,540,000 |  | 155,540,000 |  | $ 170,985,000
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | 30,903,000
Parent Company [Member] | Property management services [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Property Management Fee Revenue | 3,652,000 | 3,587,000 | 7,420,000 | 7,006,000 |
Parent Company [Member] | Asset management services [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Property Management Fee Revenue | 1,804,000 | 1,763,000 | 3,507,000 | 3,552,000 |
Parent Company [Member] | Leasing services [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Property Management Fee Revenue | 1,072,000 | 787,000 | 1,757,000 | 1,617,000 |
Parent Company [Member] | Other transaction fees [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Property Management Fee Revenue | 359,000 | $ 464,000 | 1,361,000 | $ 1,132,000 |
Parent Company [Member] | Management, transaction, and other fee [Member] |  |  |  |  |
Schedule of management, transaction, and other fees [Line Items] |  |  |  |  |
Accounts Receivable, Net |  |  |  |  | $ 8,700,000
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 | $ 30,900,000 |  | $ 30,900,000 |  |

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