Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments And Hedging Strategies (Narrative) (Details)

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Derivative Instruments And Hedging Strategies (Narrative) (Details) - Jun. 30, 2015 - Cash Flow Hedging [Member] - USD ($)
$ in Millions
Total
Mexmar [Member]  
Derivative [Line Items]  
Fixed interest rate range, minimum 1.71%
Fixed interest rate range, maximum 2.05%
Derivative, Notional Amount $ 124.5
Sea-Cat Crewzer II [Member]  
Derivative [Line Items]  
Fixed interest rate 1.52%
Derivative, Notional Amount $ 26.8
Sea Cat Crewzer [Member]  
Derivative [Line Items]  
Fixed interest rate 1.52%
Derivative, Notional Amount $ 23.8
SCFCo Holdings [Member]  
Derivative [Line Items]  
Fixed interest rate range, minimum 1.53%
Fixed interest rate range, maximum 1.62%
Derivative, Notional Amount $ 13.2
Seajon [Member]  
Derivative [Line Items]  
Fixed interest rate 2.79%
Derivative, Notional Amount $ 33.9