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Vessels, Net (Details) - USD ($)
6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2017
Accumulated depreciation      
Vessels, net $ 1,571,311,420   $ 1,603,469,247
Vessels      
Cost      
Balance at the beginning of the period 1,728,769,295    
Other additions 218,685    
Balance at the end of the period 1,728,987,980    
Accumulated depreciation      
Balance at the beginning of the period (125,300,048)    
Impairment 0 $ 0  
Depreciation (32,376,512)    
Balance at the end of the period (157,676,560)    
Mortgaged VLGC vessels, carrying value $ 1,571,300,000   $ 1,603,500,000