Employee Benefit Plans (Schedule of Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplemental Executive Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate for benefit obligation	4.00%	4.75%	3.75%
Discount rate for net period benefit cost	4.75%	3.75%	4.75%
Rate of compensation increase for benefit obligation	4.00%	4.50%	4.50%
Rate of compensation increase for net periodic benefit cost	4.50%	4.50%	4.50%
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate for benefit obligation	4.00%	5.02%	4.05%
Discount rate for net period benefit cost	5.02%	4.05%	4.75%
Health care cost trend rate assumed for future years	7.00%	7.00%	7.00%