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Employee Benefit Plans - Components of net periodic benefit cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Settlement loss $ 4,660    
Retirement Income Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0 $ 0 $ 0
Interest cost 1,645 1,960 1,832
Expected return on plan assets (1,581) (2,598) (2,837)
Amortization of net losses 986 919 824
Settlement loss 4,660    
Net periodic benefit cost $ 5,710 $ 281 $ (181)