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Significant Accounting Policies - Investment in Marketable Securities (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Investment in Marketable Securities |  |  |
Marketable Securities |  | $ 29,887 | $ 28,638
Proceeds from sale of marketable securities | $ 55,100 |  |
Realized gain (loss) on investment in marketable securities | $ (3,300) |  |
Fair Value |  |  |
Investment in Marketable Securities |  |  |
Marketable Securities |  | 29,887 | 28,638
Commercial mortgage-backed securities |  |  |
Investment in Marketable Securities |  |  |
Marketable Securities |  | 29,887 | 28,638
Cost basis of commercial mortgage backed securities |  | 27,500 | 27,500
Equity marketable securities |  |  |
Investment in Marketable Securities |  |  |
Cost basis of commercial mortgage backed securities |  | $ 0 | $ 0

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