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Fair Value of Assets and Liabilities - Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Gains (losses) on equity securities, net | $ (8,339) | $ (9,943)
Five Star |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Equity securities investment (in shares) | 10,691,658 |
Recurring | Five Star |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Investments in affiliates, fair value | $ 65,433 |
Recurring | Five Star | Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Investments in affiliates, fair value | 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 | 65,433 |
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 |
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 |
Common Shares | Five Star |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Equity securities investment (in shares) | 10,691,658 |

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