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Allowance for credit losses (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jan. 01, 2020
Allowance For Credit Loss [Roll Forward]    
Allowance for credit losses at beginning of period $ 0  
Cumulative effect due to adoption of new accounting standard 64,263  
Current period provision for expected credit losses 33,999  
Write-offs charged against the allowance 0  
Allowance for credit losses at end of period 64,263  
Cumulative effect due to adoption of new accounting standard    
Allowance For Credit Loss [Roll Forward]    
Allowance for credit losses at beginning of period 30,264  
Cumulative effect due to adoption of new accounting standard $ 30,264 $ 30,300