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v3.20.4

Investments (Narrative) (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
May 20, 2020 | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Loss on investment at fair value |  | $ 143,510 | $ 0 | $ 0
Undistributed earnings of investments |  | 42,100 | 39,400 |
Recurring |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Investment, at fair value |  | 12,110 |  |
Level 1 | Recurring |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Investment, at fair value |  | $ 12,110 |  |
Norwegian Air Shuttle ASA |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Conversion ratio | 1 |  |  |
Percentage of ordinary shares converted and sold |  | 83.00% |  |
Equity securities, percent of outstanding ordinary shares |  | 3.00% |  |
Loss on investment at fair value |  | $ 143,500 |  |
Peregrine | Variable Interest Entity, Not Primary Beneficiary |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Cost method investments |  | $ 3,300 | $ 3,300 |

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