Employee Benefit Plans (Weighted Assumptions) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
SERP Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted average discount rate	4.52%	5.50%	5.81%
Discount rate	3.89%	4.52%	5.50%
Restoration Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted average discount rate	4.57%	5.33%	5.81%
Discount rate	4.02%	4.57%	5.53%
CDS Mapping
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted average discount rate	4.00%
Discount rate	4.00%