Benefit Plans (Actuarial Assumptions for Benefit Obligations) (Details)	Dec. 31, 2016	Dec. 31, 2015
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.95%	4.15%
Expected long term rate of return	7.50%	7.50%
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.75%	2.75%