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Interest bearing debt, Credit Facility (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2021
USD ($)
May 31, 2021
USD ($)
Bank
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Mar. 31, 2021
USD ($)
Feb. 28, 2021
USD ($)
Jan. 31, 2021
USD ($)
Credit Facility [Abstract]                  
Long term debt     $ 524,799   $ 524,799        
Repayment of long-term debt     $ 1,926 $ 16,444 $ 4,490 $ 48,381      
Nordea Credit Facility [Member]                  
Credit Facility [Abstract]                  
Long term debt               $ 50,000 $ 15,000
Repayment of long-term debt $ 175,900                
Adjustment to interest rate basis [1]     1.90%   1.90%        
ABN Amro Credit Facility [Member]                  
Credit Facility [Abstract]                  
Repayment of long-term debt 6,100                
Adjustment to interest rate basis [2]     2.40%   2.40%        
Debt prepayment before installment term 33,400                
ABN Amro Revolving Credit Facility [Member]                  
Credit Facility [Abstract]                  
Long term debt             $ 60,000    
Repayment of long-term debt 60,000                
New Credit Facility [Member]                  
Credit Facility [Abstract]                  
Long term debt $ 233,800                
Number of banks the Company entered into agreement with | Bank   7              
Maximum borrowing capacity   $ 316,200              
Uncommitted accordion available   $ 250,000              
New Credit Facility [Member] | LIBOR [Member]                  
Credit Facility [Abstract]                  
Adjustment to interest rate basis   1.90%              
[1] $80.5 mill. undrawn as of September 30, 2021.
[2] $100.0 mill. undrawn as of September 30, 2021.