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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 01, 2019
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Operating lease, right-of-use asset |  |  |  |  | $ 14,600,000
Operating lease, right-of-use liability | $ 14,205,000 |  | $ 14,205,000 |  |
Operating lease cost | 800,000 |  | 1,400,000 |  |
Total revenues | $ 35,660,000 | $ 41,350,000 | 72,543,000 | $ 78,918,000 |
Adjustment to opening equity prior period |  |  | $ 500,000 |  |
Rents [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Total revenues |  | 29,500,000 |  | 57,600,000 |
Expense Recoveries [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Total revenues |  | $ 7,800,000 |  | $ 17,100,000 |
Accounts Payable and Accrued Liabilities [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Operating lease, right-of-use liability |  |  |  |  | $ 14,600,000

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