Employee Benefit Plans (Narrative) (Details) (Pension Plans, Defined Benefit)	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Assumed discount rate (percent)	4.75%	5.50%
Expected long-term rate of return on plan assets (percent)	7.50%	7.75%
Assumed rate of salary increases (percent)	4.00%	4.50%