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Employee Benefit Plan - Weighed Average Assumptions Used (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Discount Rates      
Expected long-term return on plan assets 7.25% 7.25% 7.25%
DB Pension Plan      
Discount Rates      
Benefit Cost for Plan Year 3.89% 4.05% 3.81%
Benefit Obligation at End of Plan Year 3.43% 3.89% 4.05%
Expected long-term return on plan assets 7.25%    
Rate of compensation increase      
Benefit Cost for Plan Year     5.00%
Benefit Obligation at End of Plan Year     5.00%
Life and Healthcare Plan      
Discount Rates      
Benefit Cost for Plan Year 3.97% 4.14% 3.80%
Benefit Obligation at End of Plan Year 3.51% 3.97% 4.14%
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%
SERPs      
Discount Rates      
Benefit Cost for Plan Year 4.10% 4.32% 4.00%
Benefit Obligation at End of Plan Year 3.55% 4.10% 4.32%
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%