Employee Benefit Plans (Details 5)	12 Months Ended
	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage of Assets, Other	20.00%
Defined Benefit Plan, Other Plan Assets	23.00%
Weighted average target allocations, Total	100.00%
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage of Assets, Debt Securities	22.00%
Defined Benefit Plan, Debt Securities	23.00%
Domestic equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	21.00%
Defined Benefit Plan, Equity Securities	20.00%
Non US developed equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	20.00%
Defined Benefit Plan, Equity Securities	18.00%
Non US emerging equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	6.00%
Defined Benefit Plan, Equity Securities	5.00%
Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage of Assets, Other	5.00%
Defined Benefit Plan, Other Plan Assets	5.00%
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage of Assets, Other	5.00%
Defined Benefit Plan, Other Plan Assets	4.00%
Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage of Assets, Debt Securities	1.00%
Defined Benefit Plan, Debt Securities	2.00%