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Variable Interest Entities - Narrative (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
USD ($)
vessel
Sep. 30, 2016
USD ($)
Variable Interest Entity [Line Items]    
Number of vessels in sale and leaseback transaction 7  
Interest expense | $ [1] $ 53,085 $ 53,517
Net cash received in financing activities | $ $ (300,152) (23,184)
Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Number of vessels in sale and leaseback transaction 7  
Sale and leaseback term 10 years  
Interest expense | $ $ 29,400 33,200
Net cash received in financing activities | $ $ 80,900 $ 167,700
Variable Interest Entity, Primary Beneficiary | ICBCL Agreement    
Variable Interest Entity [Line Items]    
Number of vessels in sale and leaseback transaction 4  
Variable Interest Entity, Primary Beneficiary | CMBL Agreement    
Variable Interest Entity [Line Items]    
Number of vessels in sale and leaseback transaction 1  
Variable Interest Entity, Primary Beneficiary | CCBFL Agreement    
Variable Interest Entity [Line Items]    
Number of vessels in sale and leaseback transaction 1  
Variable Interest Entity, Primary Beneficiary | COSCO Shipping Agreement    
Variable Interest Entity [Line Items]    
Number of vessels in sale and leaseback transaction 1  
[1] This includes amounts arising from transactions with related parties (see note 14).