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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, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of plan assets $ 492,827 $ 420,699
Equity securities, Common/collective trust funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of plan assets 274,810 237,015
Fixed income, Common/collective trust funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of plan assets 215,444 181,176
Cash equivalents    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of plan assets $ 2,573 $ 2,508