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Investments (Narrative) (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 20, 2020 | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Oct. 31, 2020 | Aug. 31, 2020 | Jul. 21, 2020 | Dec. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Unrealized gain on investment at fair value |  | $ 13,942 | $ 0 | $ 13,942 | $ 0 |  |  |  |
Norwegian Air Shuttle ASA |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Conversion ratio | 1 |  |  |  |  |  |  |  |
Equity securities, fair value |  | 199,600 |  | 199,600 |  |  |  |  |
Unrealized gain on investment at fair value |  | 13,900 |  | 13,900 |  |  |  |  |
Unrealized foreign currency gains |  | 5,700 |  | 5,700 |  |  |  |  |
Norwegian Air Shuttle ASA | Subsequent Event |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity securities, percent of outstanding ordinary shares |  |  |  |  |  |  |  | 13.70% |
Equity securities, perpetual bonds, percent of share capital |  |  |  |  |  |  |  | 6.20% |
Norwegian Air Shuttle ASA | Subsequent Event | Maximum |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity securities, percent converted ratio |  |  |  |  |  | 66.6666% | 33.3333% |  |
Peregrine | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity securities without readily determinable fair value, amount |  | $ 3,300 |  | $ 3,300 |  |  |  |  | $ 3,300

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