Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments And Hedging Strategies (Narrative) (Details)

v3.5.0.2
Derivative Instruments And Hedging Strategies (Narrative) (Details)
$ in Thousands, € in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
EUR (€)
Derivative [Line Items]          
Derivative losses on cash flow hedges $ (187) $ (1,540) $ (3,855) $ (2,225)  
Fixed interest rate (0.027%)   (0.027%)   (0.027%)
Derivative, Notional Amount $ 16,900   $ 16,900   € 15.0
Fair Value Hedging [Member]          
Derivative [Line Items]          
Derivative, Notional Amount $ 9,700   $ 9,700    
Cash Flow Hedging [Member] | Mexmar [Member]          
Derivative [Line Items]          
Fixed interest rate range, minimum 1.71%   1.71%   1.71%
Fixed interest rate range, maximum 2.05%   2.05%   2.05%
Derivative, Notional Amount $ 108,600   $ 108,600    
Cash Flow Hedging [Member] | Sea-Cat Crewzer II [Member]          
Derivative [Line Items]          
Fixed interest rate (1.52%)   (1.52%)   (1.52%)
Derivative, Notional Amount $ 23,900   $ 23,900    
Cash Flow Hedging [Member] | Sea Cat Crewzer [Member]          
Derivative [Line Items]          
Fixed interest rate (1.52%)   (1.52%)   (1.52%)
Derivative, Notional Amount $ 21,100   $ 21,100    
Cash Flow Hedging [Member] | Seajon [Member]          
Derivative [Line Items]          
Fixed interest rate (2.79%)   (2.79%)   (2.79%)
Derivative, Notional Amount $ 30,900   $ 30,900    
Three Point Seven Five Percentage Convertible Notes [Member]          
Derivative [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.75%   3.75%   3.75%
Construction in Progress [Member]          
Derivative [Line Items]          
Deferred Gain (Loss) on Discontinuation of Foreign Currency Fair Value Hedge $ (200)   $ (200)