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Employee Benefit Plans - Assumptions (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Determination of benefit obligation at year end:      
Discount rate 2.80% 3.45% 4.40%
Annual rate of compensation increase 4.50% 4.00% 4.00%
Determination of pension expense for year ended:      
Discount rate for the service cost 3.45% 4.40% 3.75%
Annual rate of compensation increase 4.00% 4.00% 4.00%
Expected long-term rate of return on plan assets 6.75% 6.75% 6.75%