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Employee Benefit Plans - Schedule of plan assets by fair value hierarchy (Details) - Estimate of fair value - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of plan assets $ 517,148 $ 492,827
Equity securities, Common/collective trust funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of plan assets 261,810 274,810
Fixed income, Common/collective trust funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of plan assets 252,731 215,444
Cash equivalents    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of plan assets $ 2,607 $ 2,573