Employee Benefit Plans (Schedule of Weighted Average Assumptions to Determine Net Costs) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	4.40%	5.40%	6.00%
Rate of compensation increase	5.90%	5.90%	6.00%
Other Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	4.50%	5.50%	6.00%
Rate of compensation increase	3.50%	3.50%	3.50%