Employee Benefit Plans (Narrative) (Details) (Pension Plans, Defined Benefit [Member])	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumed discount rate	4.75%		5.50%
Expected long-term rate of return on plan assets	7.50%		7.75%
Assumed rate of salary increases		4.00%	4.50%