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Long-Term Debt - Nordea Credit Agreement (Details) - Nordea Q5000 Loan Maturing January 2021 - USD ($) $ in Millions |  | 1 Months Ended
--- | --- | ---
Mar. 11, 2020 | Apr. 30, 2015 | Sep. 30, 2014
Debt Instrument [Line Items] |  |  |
Borrowing capacity |  |  | $ 250.0
Funded amount |  | $ 250.0 |
Frequency of periodic payment |  |  | quarterly
Scheduled principal installments |  |  | $ 8.9
Balloon payment | $ 53.6 |  | $ 80.4
Maturity date | Jan. 31, 2021 |  | Apr. 30, 2020
LIBOR |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate (as a percent) | 2.75% |  | 2.50%

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