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Summary of Significant Accounting Policies (Details) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) Segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2018 USD ($) | Jan. 01, 2017 USD ($) | Dec. 31, 2015 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of operating segments | Segment | 1 |  |  |  |  |
Fees paid to unaffiliated advisers | $ 46,700 | $ 46,700 | $ 47,200 |  |  |
Adjustment for adoption of ASU |  |  |  |  | $ 1,051 |
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 2016-01 |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Adjustment for adoption of ASU |  |  |  | $ 200 |  |
Accounting Standards Update 2016-18 |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash pledged or on deposit of CIP |  | $ 800 | $ 1,000 |  |  | $ 10,400

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