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Long-Term Debt - Nordea Credit Agreement (Details) - Nordea Q5000 Loan Maturing April 2020 [Member] - USD ($) $ in Millions | 1 Months Ended |
--- | --- | ---
Apr. 30, 2015 | Sep. 30, 2014 | Jun. 30, 2015
Debt Instrument [Line Items] |  |  |
Borrowing capacity |  | $ 250.0 |
Funded amount | $ 250.0 |  |
Maturity date |  | Apr. 30, 2020 |
Scheduled principal installments |  | $ 8.9 |
Frequency of periodic payment |  | quarterly |
Balloon payment |  | $ 80.4 |
Interest Rate Swaps [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notional amount |  |  | $ 187.5
Fixed LIBOR rate on interest rate swaps (as a percent) |  |  | 1.50%
LIBOR [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate (as a percent) |  | 2.50% |

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