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Restructuring and other related costs - Restructuring related liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2020
Dec. 31, 2018
Dec. 31, 2017
Restructuring Reserve [Roll Forward]          
Restructuring (income) loss $ 22,176 $ 0 $ (5,982) $ 0 $ 0
Employee severance and related expenses          
Restructuring Reserve [Roll Forward]          
Beginning balance 0   96    
Restructuring (income) loss 600   (22)    
Cash disbursements (504)   (74)    
Ending balance 96   0 0  
Other costs          
Restructuring Reserve [Roll Forward]          
Beginning balance 0   675    
Restructuring (income) loss 1,118   1,634    
Cash disbursements (443)   (2,309)    
Ending balance 675   0 0  
Employee severance and related expenses and other costs          
Restructuring Reserve [Roll Forward]          
Beginning balance 0   771    
Restructuring (income) loss 1,718   1,612    
Cash disbursements (947)   (2,383)    
Ending balance $ 771   $ 0 $ 0