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Lease financing (Tables)
12 Months Ended
Dec. 31, 2019
Lease Commitments Tables Abstract  
Capital lease obligations, Principal payments
Twelve month periods ending     Amount
December 31, 2020   $ 69,820
December 31, 2021     68,255
December 31, 2022     66,144
December 31, 2023     137,160
December 31, 2024     25,809
December 31, 2025 and thereafter     122,318
Total bareboat lease minimum payments   $ 489,506
Unamortized debt issuance costs           (3,936)
Total bareboat lease minimum payments, net   $ 485,570
Excluding bareboat lease interest          (63,594)
Lease commitments – short term     52,145
Lease commitments – long term     369,831