Employee Benefit Plans (Weighted Assumptions) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
RELS Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted average discount rate	4.44%	4.09%
Discount rate	3.97%	4.44%
Defined Benefit Plan, Expected Return on Plan Assets	3.50%	3.70%
SERPs
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted average discount rate	4.20%	3.85%	4.72%
Discount rate	4.00%	4.20%
Restoration Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted average discount rate	4.32%	3.98%	4.82%
Discount rate	4.08%	4.32%