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Commitments And Contingencies And Other Matters - Narrative (Details)
$ in Thousands
1 Months Ended 9 Months Ended
Feb. 28, 2014
vessel
Sep. 30, 2013
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Commitments And Contingencies [Line Items]        
Total investment     $ 2,612,407 $ 2,450,890
Q7000 [Member]        
Commitments And Contingencies [Line Items]        
Contract amount   $ 346,000    
Total investment     213,600  
Payment of shipyard costs     $ 138,400  
Q7000 [Member] | Contract Signing [Member]        
Commitments And Contingencies [Line Items]        
Percentage of contract price paid or to be paid     20.00%  
Q7000 [Member] | Due 2016 [Member]        
Commitments And Contingencies [Line Items]        
Percentage of contract price paid or to be paid     20.00%  
Q7000 [Member] | Issuance of Completion Certificate [Member]        
Commitments And Contingencies [Line Items]        
Percentage of contract price paid or to be paid     20.00%  
Q7000 [Member] | Vessel Delivery [Member]        
Commitments And Contingencies [Line Items]        
Percentage of contract price paid or to be paid     40.00%  
Monohull Vessels [Member]        
Commitments And Contingencies [Line Items]        
Number of chartered vessels | vessel 2      
Topside Equipment [Member]        
Commitments And Contingencies [Line Items]        
Total investment     $ 304,100  
Siem [Member] | Monohull Vessels [Member]        
Commitments And Contingencies [Line Items]        
Term of charter agreement 7 years      
Petrobras [Member]        
Commitments And Contingencies [Line Items]        
Term of contract 4 years