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Employee Benefit Plans Assumptions in Computing Benefit Obligation (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Retirement Benefits [Abstract]    
Discount rate 0.66% 0.85%
Rate of increase in compensation levels 1.00% 1.00%
Expected long-term rate of return on plan assets 0.66% 0.85%