Annual report pursuant to Section 13 and 15(d)

Stock-Based Awards (Summary Of Status Of Nonvested RSUs) (Details)

v3.6.0.2
Stock-Based Awards (Summary Of Status Of Nonvested RSUs) (Details) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Current Fiscal Year End Date --12-31    
Dividend equivalents [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Nonvested RSUs, beginning balance (in shares) 83,132    
Nonvested RSUs, ending balance (in shares) 74,181 83,132  
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Nonvested RSUs, beginning balance (in shares) 674,894    
Granted, RSUs (in shares) 318,228    
Vested, RSUs (in shares) (152,252)    
Forfeited, RSUs (in shares) (102,843)    
Nonvested RSUs, ending balance (in shares) 762,629 674,894  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Nonvested, beginning balance weighted average grant date fair value (in usd per share) $ 57.92    
Granted, weighted average grant date fair value (in usd per share) 44.16 $ 65.89 $ 55.06
Vested, weighted average grant date fair value (in usd per share) 58.45    
Forfeited, weighted average grant date fair value (in usd per share) 56.01    
Nonvested, ending balance weighted average grant date fair value (in usd per share) $ 51.86 $ 57.92  
Dividend equivalents [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Granted, RSUs (in shares) 24,602    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Granted, weighted average grant date fair value (in usd per share) $ 0.00