Employee Benefit Plans Assumptions Used to Determine Net Periodic Pension Benefit Costs (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	4.25%	5.25%	5.75%
Expected long-term rate of return on plan assets	5.75%	6.50%	6.50%
Minimum | Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected annual salary increases	0.00%	0.00%	0.00%
Maximum | Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected annual salary increases	3.00%	3.00%
Pension Plans | Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected annual salary increases			3.00%