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Long-term debt (Tables)
 12 Months Ended
Dec. 31, 2017
Long-term Debt [Abstract]  
Long-term debt, Principal payments
Twelve month periods ending
 
 
Amount
December 31, 2018
 
$
173,958
December 31, 2019
 
 
268,745
December 31, 2020
 
 
75,665
December 31, 2021
 
 
132,152
December 31, 2022
 
 
57,880
December 31, 2023 and thereafter
 
 
47,814
Total Long term debt
 
$
756,214
Unamortized debt issuance costs
 
 
7,119
Total Long term debt, net
 
$
749,095
Current portion of long term debt
 
 
173,958
Long term debt, net
 
 
575,137
Interest and finance costs
 
 
 
 
 
 
 
 
 
 
2015
 
 
2016
 
 
2017
Interest on long term debt and capital leases
$
35,969  
 
$
40,449  
 
$
48,814  
Less: Interest capitalized
 
(12,079)  
 
 
(3,940)  
 
 
(2,423)  
Reclassification adjustments of interest rate swap loss transferred to Interest and finance costs from Other Comprehensive Income (Note 18)
 
2,416  
 
 
1,252  
 
 
852  
Amortization of debt issuance costs
 
2,732  
 
 
2,855  
 
 
2,660  
Other bank and finance charges
 
623  
 
 
601  
 
 
555  
Interest and finance costs
$
29,661
 
$
41,217
 
$
50,458