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Employee Benefit Plans (Narrative) (Details) (Defined Benefit Pension)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Defined Benefit Pension
Defined Benefit Plan Disclosure [Line Items]
Assumed discount rate (percent)	4.00%	4.75%
Expected long-term rate of return on plan assets (percent)	7.25%	7.50%
Assumed rate of salary increases (percent)	4.00%	4.00%

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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