Employee Benefit Plans (Summary of Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Costs) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee Benefit Plans [Abstract]
Benefit obligations, Discount rate	3.98%	5.24%	5.26%
Net periodic benefit cost, Discount rate	5.24%	5.26%	5.80%
Net periodic benefit cost, Expected long-term return on plan assets	7.00%	7.00%	7.00%