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Employee Benefit Plans Plan Asset Allocation (Details)
Nov. 29, 2012
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target Allocation Percentage of Assets, Rebalancing Allocation 5.00%    
Actual Allocation   100.00% 100.00%
Marketable equity securities      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target Allocation Percentage of Assets 50.00%    
Actual Allocation   51.00% 50.00%
Investment Grade Fixed Income Investments [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target Allocation Percentage of Assets 30.00%    
Actual Allocation   30.00% 29.00%
High Yield Fixed Income Investments [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target Allocation Percentage of Assets 10.00%    
Actual Allocation   11.00% 10.00%
Alternative Investments [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target Allocation Percentage of Assets 5.00%    
Actual Allocation   3.00% 5.00%
Short-term Investments [Member]      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target Allocation Percentage of Assets 5.00%    
Actual Allocation   5.00% 6.00%