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Fair Value of Assets and Liabilities - Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Losses on equity securities, net | $ (3,849) | $ 11,974 | $ (12,188) | $ 2,031
Five Star |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Equity securities investment (in shares) | 10,691,658 |  | 10,691,658 |
Recurring | Five Star |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Investments in affiliates, fair value | $ 61,584 |  | $ 61,584 |
Recurring | Five Star | Carrying Amount |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Investments in affiliates, fair value | 44,448 |  | 44,448 |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Five Star |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Investments in affiliates, fair value | 61,584 |  | 61,584 |
Recurring | Significant Other Observable Inputs (Level 2) | Five Star |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Investments in affiliates, fair value | 0 |  | 0 |
Recurring | Significant Unobservable Inputs (Level 3) | Five Star |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Investments in affiliates, fair value | $ 0 |  | $ 0 |
Common Shares | Five Star |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Equity securities investment (in shares) | 10,691,658 |  | 10,691,658 |

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