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Finance leases (Details 1) - Capital Lease Obligations [Member] - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Capital Leased Assets [Line Items]    
2019 $ 20,384,641  
2020 26,868,097  
2021 26,523,339  
2022 26,470,805  
2023 38,028,900  
2024 – 2030 140,757,800  
Total minimum finance lease payments 279,033,582 $ 296,181,882
Amounts representing interest and deferred finance fees (50,163,519) (54,705,784)
Net minimum finance lease payments 228,870,063 241,476,098
Amount receivable in respect of finance leases (2,880,000) (2,880,000)
Adjusted net minimum finance lease payments $ 225,990,063 $ 238,596,098