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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%