Annual report pursuant to Section 13 and 15(d)

Retirement Plans and Related Post Retirement Benefits - Assumptions Used to Determine the Net Periodic Cost (Details)

v3.19.3.a.u2
Retirement Plans and Related Post Retirement Benefits - Assumptions Used to Determine the Net Periodic Cost (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SERP      
Defined Benefit Plan Disclosure      
Discount Rate 4.20% 3.60% 4.20%
Future Average Compensation Increases 2.00%    
SERP Medical      
Defined Benefit Plan Disclosure      
Discount Rate 4.20% 3.60% 4.20%
Future Average Compensation Increases 4.98% 5.38% 5.50%
SERP Medical | Minimum      
Defined Benefit Plan Disclosure      
Future Average Compensation Increases   2.00% 3.00%
SERP Medical | Maximum      
Defined Benefit Plan Disclosure      
Future Average Compensation Increases   3.00% 5.00%