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Redeemable noncontrolling interest (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]      
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount $ 13,543 $ 13,611 $ 8,531
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest 2,377 3,462  
Temporary Equity, Interest in Subsidiary Earnings (1,505) (527)  
Temporary Equity, Accretion to Redemption Value (940) $ (2,145)  
2020 85    
2021 85    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 85    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 85    
Finite-Lived Intangible Assets, Amortization Expense, Year Five $ 85