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Share-Based Compensation Plans Stock Options (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options Outstanding, Number, Beginning Balance 36,000    
Options, Exercises in Period (3,000) (6,000) 0
Options Outstanding, Number, Ending Balance 33,000 [1] 36,000  
Options, Vested, Number 33,000    
Options, Exercisable, Number 33,000    
Options, Outstanding, Weighted Average Exercise Price, Beginning Balance $ 33.81    
Options, Exercises in Period, Weighted Average Exercise Price 27.44    
Options, Outstanding, Weighted Average Exercise Price, Ending Balance 34.38 [1] $ 33.81  
Options, Vested, Weighted Average Exercise Price 34.38    
Options, Exercisable, Weighted Average Exercise Price $ 34.38    
Options, Outstanding, Weighted Average Remaining Contractual Term [1] 1 year 8 months    
Options, Vested, Weighted Average Remaining Contractual Term 1 year 8 months    
Options, Exercisable, Weighted Average Remaining Contractual Term 1 year 8 months    
Options, Outstanding, Aggregate Intrinsic Value [1] $ 0    
Options, Vested, Aggregate Intrinsic Value 0    
Options, Exercisable, Aggregate Intrinsic Value $ 0    
[1] All stock options outstanding at December 31, 2015 were vested and exercisable.