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Employee Benefit Plans - FV of Plan Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Employee Benefit Plans      
Fair Value $ 30,084 $ 25,689 $ 19,672
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Employee Benefit Plans      
Fair Value 29,773 25,082  
Other Observable Inputs (Level 2)      
Employee Benefit Plans      
Fair Value 311 607  
Significant Unobservable Inputs (Level 3)      
Employee Benefit Plans      
Fair Value 0 0  
Cash equivalents      
Employee Benefit Plans      
Fair Value 666 1,940  
Cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Employee Benefit Plans      
Fair Value 666 1,940  
Cash equivalents | Other Observable Inputs (Level 2)      
Employee Benefit Plans      
Fair Value 0 0  
Cash equivalents | Significant Unobservable Inputs (Level 3)      
Employee Benefit Plans      
Fair Value 0 0  
U.S government agency obligations      
Employee Benefit Plans      
Fair Value 311 300  
U.S government agency obligations | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Employee Benefit Plans      
Fair Value 0 0  
U.S government agency obligations | Other Observable Inputs (Level 2)      
Employee Benefit Plans      
Fair Value 311 300  
U.S government agency obligations | Significant Unobservable Inputs (Level 3)      
Employee Benefit Plans      
Fair Value 0 0  
Corporate bonds      
Employee Benefit Plans      
Fair Value   307  
Corporate bonds | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Employee Benefit Plans      
Fair Value   0  
Corporate bonds | Other Observable Inputs (Level 2)      
Employee Benefit Plans      
Fair Value   307  
Corporate bonds | Significant Unobservable Inputs (Level 3)      
Employee Benefit Plans      
Fair Value   0  
Equity securities:      
Employee Benefit Plans      
Fair Value 1,473 1,436  
Equity securities: | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Employee Benefit Plans      
Fair Value 1,473 1,436  
Equity securities: | Other Observable Inputs (Level 2)      
Employee Benefit Plans      
Fair Value 0 0  
Equity securities: | Significant Unobservable Inputs (Level 3)      
Employee Benefit Plans      
Fair Value 0 0  
Mutual Fund      
Employee Benefit Plans      
Fair Value 27,634 21,706  
Mutual Fund | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Employee Benefit Plans      
Fair Value 27,634 21,706  
Mutual Fund | Other Observable Inputs (Level 2)      
Employee Benefit Plans      
Fair Value 0 0  
Mutual Fund | Significant Unobservable Inputs (Level 3)      
Employee Benefit Plans      
Fair Value $ 0 $ 0