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Employee Benefit Plans 17 (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Retirement Benefits [Abstract]      
Employer's contribution $ 2.7 $ 2.7 $ 2.5
Employer discretionary contribution amount $ 1.9 $ 1.9 $ 1.6