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Summary Of Significant Accounting Policies - Recertification Costs And Deferred Dry Dock Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]      
Deferred dry dock costs, net (Note 2) $ 14,766 $ 19,615  
Accumulated amortization deferred dry dock 10,700 18,300  
Dry dock amortization expense $ 14,000 $ 10,800 $ 14,100
Minimum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Dry dock amortization period 30 months    
Dry dock recertification process period 1 month    
Maximum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Dry dock amortization period 60 months    
Dry dock recertification process period 2 months