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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments at fair value $ 2,598,900 $ 2,677,700
Total Investments at fair value, estimated fair value 2,598,900 2,677,700
Cash and cash equivalents 146,300 73,300
Cash and cash equivalents, estimated fair value 146,300 73,300
Equity securities at cost 6,400 0
Restricted cash and cash equivalents 1,000 1,000
Notes payable 20,000 20,000
Notes Payable, estimated fair value 23,500 23,600
Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Restricted cash and cash equivalents $ 1,000 $ 1,000