v2.4.0.6
Employee Benefit Plans (Details 8)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Summary of target asset allocation and actual asset allocation for defined benefit pension plans    
Target Asset Allocation, Debt Securities 65.00%  
Target Asset Allocation, Equity Securities 35.00%  
Target Asset Allocation, percentage of assets, Total 100.00%  
Actual Asset Location, Debt Securities 66.00% 57.00%
Actual Asset Location, Equity Securities 33.00% 42.00%
Actual Asset Location, Cash or cash equivalents 1.00% 1.00%
Actual Plan Asset Allocations, Total 100.00% 100.00%