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Events after the reporting period (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2020
Apr. 29, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Events after the reporting period          
Repayment of debt     $ 329,501 $ 106,514 $ 453,948
New receivables funding agreement | New senior loans          
Events after the reporting period          
Repayment of debt   $ 34,500      
New receivables funding agreement | New senior loans | Maximum          
Events after the reporting period          
Gross loan commitments   $ 150,000      
Cancellation of Cross-Currency Swap          
Events after the reporting period          
Cash receipts from swap $ 3,608