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Financial instruments, Derivatives interest rate swaps (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Derivatives - interest rate swaps [Abstract]    
Notional amount $ 379,916 $ 402,049
Fair value $ 15,600 5,736
Swap Pays 2.987% [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 2.987%  
Expiries Apr. 20, 2023  
Notional amount $ 44,400 46,800
Fair value $ 1,748 699
Swap Pays 3.012%, [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 3.012%  
Expiries Apr. 20, 2023  
Notional amount $ 44,400 46,800
Fair value $ 1,780 743
Swap Pays 3.019% [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 3.019%  
Expiries Sep. 29, 2023  
Notional amount $ 33,310 35,877
Fair value $ 1,425 580
Swap Pays 3.019% [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 3.019%  
Expiries Sep. 29, 2023  
Notional amount $ 32,396 34,963
Fair value $ 1,380 563
Swap Pays 2.8665% [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 2.8665%  
Expiries Sep. 29, 2023  
Notional amount $ 48,830 51,400
Fair value $ 1,976 606
Swap Pays 2.8785% [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 2.8785%  
Expiries Jun. 30, 2023  
Notional amount $ 43,240 45,807
Fair value $ 1,681 503
Swap Pays 2.885% [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 2.885%  
Expiries Sep. 29, 2023  
Notional amount $ 48,188 50,115
Fair value $ 1,961 653
Swap Pays 2.897% [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 2.897%  
Expiries Sep. 30, 2023  
Notional amount $ 43,419 45,986
Fair value $ 1,789 597
Swap Pays 3.020% [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 3.02%  
Expiries Sep. 29, 2023  
Notional amount $ 41,734 44,301
Fair value $ 1,859 $ 793