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Variable Interest Entities - Narrative (Details) - 6 months ended Jun. 30, 2015 - ICBCL Agreement - Variable Interest Entity, Primary Beneficiary - vessel
Total
Variable Interest Entity [Line Items]  
Number of vessels in sale and leaseback transaction 4
Sale and leaseback term 10 years
Option to repurchase vessel under sale and leaseback (earliest) 5 years