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Employee Benefit Plans - Weighed Average Assumptions Used (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
DB Pension Plans      
Discount Rates      
Benefit Cost for Plan Year 3.43% 3.89% 4.05%
Benefit Obligation at End of Plan Year 4.08% 3.43% 3.89%
Expected long-term return on plan assets 7.25% 7.25% 7.25%
Life and Healthcare Plan      
Discount Rates      
Benefit Cost for Plan Year 3.51% 3.97% 4.14%
Benefit Obligation at End of Plan Year 4.13% 3.51% 3.97%
Rate of compensation increase      
Benefit Cost for Plan Year 5.00% 5.00% 5.00%
Benefit Obligation at End of Plan Year 4.00% 5.00% 5.00%
SERP Plan      
Discount Rates      
Benefit Cost for Plan Year 3.55% 4.10% 4.32%
Benefit Obligation at End of Plan Year 4.16% 3.55% 4.10%
Rate of compensation increase      
Benefit Cost for Plan Year 5.00% 5.00% 5.00%
Benefit Obligation at End of Plan Year 5.00% 5.00% 5.00%