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

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