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Employee Benefit Plans (Plan Asset Allocation) (Details)
Nov. 29, 2012
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target allocation, rebalancing range 5.00%    
Actual allocation   100.00% 100.00%
Marketable equity securities      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target allocation 55.00%    
Actual allocation   54.00% 51.00%
Investment grade fixed income securities      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target allocation 30.00%    
Actual allocation   30.00% 30.00%
High yield fixed income securities      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target allocation 10.00%    
Actual allocation   10.00% 11.00%
Alternative investments      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Actual allocation   2.00% 3.00%
Short-term investments      
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target allocation 5.00%    
Actual allocation   4.00% 5.00%