Stock-Based Compensation Arrangements (Performance-Based Shares) (Details)	Dec. 31, 2012
[MaximumMember]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Range Of Shares Percent	200.00%
[MinimumMember]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Range Of Shares Percent	0.00%