Employee Benefit Plans - Actual and Target Allocations of Plan Assets (Details) (U.S. Pension Plan, Defined Benefit [Member])	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Actual plan asset allocations	100.00%	100.00%
Target plan asset allocations	100.00%
Equity securities [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Actual plan asset allocations	57.00%	56.00%
Target plan asset allocations	58.00%
Fixed income investments [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Actual plan asset allocations	36.00%	36.00%
Target plan asset allocations	35.00%
Real estate funds [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Actual plan asset allocations	7.00%	8.00%
Target plan asset allocations	7.00%