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Commitments And Contingencies And Other Matters (Narrative) (Details)
$ in Thousands
1 Months Ended 3 Months Ended
Feb. 29, 2016
Dec. 31, 2015
USD ($)
payment_installment
Jul. 31, 2015
USD ($)
Apr. 30, 2015
Feb. 28, 2014
vessel
Sep. 30, 2013
USD ($)
Oct. 31, 2012
Mar. 31, 2016
USD ($)
Nov. 30, 2014
USD ($)
Commitments And Contingencies [Line Items]                  
Total investment   $ 2,544,857           $ 2,551,363  
Charter fee deposit   $ 12,544           12,544  
Grand Canyon [Member]                  
Commitments And Contingencies [Line Items]                  
Term of charter agreement             5 years    
Grand Canyon and Grand Canyon III [Member]                  
Commitments And Contingencies [Line Items]                  
Term of charter agreement 7 years                
Grand Canyon II [Member]                  
Commitments And Contingencies [Line Items]                  
Term of charter agreement 6 years     5 years          
Q7000 [Member]                  
Commitments And Contingencies [Line Items]                  
Contract amount           $ 346,000      
Percentage of contract price to be paid   80.00%       80.00%      
Number of installments to be paid | payment_installment   3              
Total investment               114,500  
Q7000 [Member] | Contract Signing [Member]                  
Commitments And Contingencies [Line Items]                  
Percentage of contract price to be paid           20.00%      
Q7000 [Member] | Due June 2016 [Member]                  
Commitments And Contingencies [Line Items]                  
Percentage of contract price to be paid   20.00%              
Q7000 [Member] | Issuance of Completion Certificate [Member]                  
Commitments And Contingencies [Line Items]                  
Percentage of contract price to be paid   20.00%              
Q7000 [Member] | Vessel Delivery [Member]                  
Commitments And Contingencies [Line Items]                  
Percentage of contract price to be paid   40.00%              
Q7000 [Member] | Capital Addition Purchase Commitments [Member] | Extend Scheduled Delivery [Member]                  
Commitments And Contingencies [Line Items]                  
Total investment           $ 14,500      
Q7000 [Member] | Capital Addition Purchase Commitments [Member] | Contract Signing [Member]                  
Commitments And Contingencies [Line Items]                  
Payments of shipyard incremental costs               69,200  
Q7000 [Member] | Capital Addition Purchase Commitments [Member] | Contract Signing [Member] | Extend Scheduled Delivery [Member]                  
Commitments And Contingencies [Line Items]                  
Payments of shipyard incremental costs     $ 7,300            
Monohull Vessels [Member]                  
Commitments And Contingencies [Line Items]                  
Term of charter agreement         4 years        
Number of vessels under construction | vessel         2        
Charter fee deposit                 $ 12,500
Topside Equipment [Member]                  
Commitments And Contingencies [Line Items]                  
Total investment               $ 125,100