Retirement Plan (Allocation of Retirement Plan Assets) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target Allocation 2013	100.00%
Percentage of Plan Assets at Year End	100.00%	100.00%
Cash and cash equivalents
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target Allocation 2013	100.00%
Percentage of Plan Assets at Year End	93.00%	0.00%
Debt securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target Allocation 2013	0.00%
Percentage of Plan Assets at Year End	0.00%	62.00%
Equity securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target Allocation 2013	0.00%
Percentage of Plan Assets at Year End	0.00%	30.00%
Alternative investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target Allocation 2013	0.00%
Percentage of Plan Assets at Year End	7.00%	8.00%