Employee Benefit Plans (Target and Actual Asset Allocation for Pension Plan by Asset Category) (Details) (Employee Pension Plans [Member])	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Pension Plan Assets
Target asset allocation (as a percent)	100.00%
Actual asset allocation (as a percent)	100.00%	100.00%
Cash [Member]
Pension Plan Assets
Target asset allocation (as a percent)	5.00%
Actual asset allocation (as a percent)	6.20%	5.20%
Equity Securities: Domestic [Member]
Pension Plan Assets
Target asset allocation (as a percent)	65.00%
Actual asset allocation (as a percent)	62.90%	63.40%
Equity Securities: International [Member]
Pension Plan Assets
Target asset allocation (as a percent)	25.00%
Actual asset allocation (as a percent)	25.90%	25.90%
Fixed Income Securities [Member]
Pension Plan Assets
Target asset allocation (as a percent)	5.00%
Actual asset allocation (as a percent)	5.00%	5.50%