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v3.19.3.a.u2

Summary of Significant Accounting Policies (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) Segment | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Number of operating segments (in segments) | Segment | 1 |  |  |
Fees paid to unaffiliated advisers | $ 40,500 | $ 46,700 | $ 46,700 |
Operating lease right of use assets | 21,000 |  |  |
Operating lease liabilities | $ 29,402 |  |  |
Minimum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Exercise period | 4 years |  |  |
Weighted average of useful life | 5 years |  |  |
Maximum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Exercise period | 7 years |  |  |
Weighted average of useful life | 16 years |  |  |
Furniture And Office Equipment | Minimum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of furniture and equipment | 3 years |  |  |
Furniture And Office Equipment | Maximum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of furniture and equipment | 7 years |  |  |
Computer equipment and software | Minimum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of furniture and equipment | 3 years |  |  |
Computer equipment and software | Maximum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of furniture and equipment | 5 years |  |  |
Accounting Standards Update 2016-02 |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Operating lease right of use assets |  |  |  | $ 20,500
Operating lease liabilities |  |  |  | $ 28,600

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