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Stock based compensation - Summary of Stock-based Compensation Expenses (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock based compensation expense, net of tax $ 1,582
One-time IPO Unit Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock based compensation expense, net of tax 725
Unit Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock based compensation expense, net of tax 564
Option Award [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock based compensation expense, net of tax $ 293