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Long-Term Debt (Details) - USD ($)
 3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Mar. 31, 2017
Mar. 31, 2015
Long-Term Debt          
Financing costs paid $ 2,541,005 $ 42,047      
Drawdowns 97,000,000        
Presented as follows:          
Total debt obligations     $ 742,420,228 $ 770,102,728  
Less: deferred financing fees 20,138,480   22,095,916 20,138,480  
Current portion of long-term debt     45,658,482 65,978,785  
Long-term debt—net of current portion and deferred financing fees     674,665,830 683,985,463  
Total     720,324,312 749,964,248  
Long-term Debt, Other Disclosures [Abstract]          
Deferred finance fees, beginning 20,138,480        
Additions 2,883,059        
Amortization (1,098,827) $ (948,407)      
Deferred finance fees, end $ 22,095,916        
Royal Bank of Scotland plc (RBS)          
Presented as follows:          
Total debt obligations       99,882,500  
Tranche A          
Presented as follows:          
Total debt obligations       34,000,000  
Tranche B          
Presented as follows:          
Total debt obligations       25,570,000  
Tranche C          
Presented as follows:          
Total debt obligations       40,312,500  
2015 Debt Facility          
Long-Term Debt          
Original loan amount         $ 758,000,000
Presented as follows:          
Total debt obligations     645,420,228 670,220,228  
Commercial Financing          
Presented as follows:          
Total debt obligations     219,362,501 227,512,277  
KEXIM Direct Financing          
Presented as follows:          
Total debt obligations     167,710,376 177,680,534  
KEXIM Guaranteed          
Presented as follows:          
Total debt obligations     172,450,332 175,773,718  
K-sure Insured          
Presented as follows:          
Total debt obligations     $ 85,897,019 $ 89,253,699