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Stock Incentive Plan Stock Incentive Plan (Restricted Stock Units) (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock Appreciation Rights (SARs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 2 years 6 months      
Weighted average grant date fair value (in dollars per share)   $ 11.34 $ 12.88 $ 11.45
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Shares awarded but not earned at December 31 (in shares) 550,050 550,050    
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 1 year 6 months      
Weighted average grant date fair value (in dollars per share)   $ 61.01 $ 71.40 61.94
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Shares awarded but not earned at January 1 (in shares)   938,862    
Shares awarded (in shares)   542,180    
Shares forfeited (in shares)   (45,346)    
Shares earned (in shares)   (503,514)    
Shares awarded but not earned at December 31 (in shares) 932,182 932,182 938,862  
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 1 year 6 months      
Weighted average grant date fair value (in dollars per share)   $ 61.01 $ 63.99 $ 61.99
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Shares awarded but not earned at January 1 (in shares)   352,975    
Shares awarded (in shares)   165,160    
Shares forfeited (in shares)   (8,424)    
Shares earned (in shares)   (113,182)    
Shares awarded but not earned at December 31 (in shares) 396,529 396,529 352,975  
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights, Share Conversion Ratio   1    
Share-based Payment Arrangement, Tranche One [Member] | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   33.33%    
Share-based Payment Arrangement, Tranche Two [Member] | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   33.33%    
Share-based Payment Arrangement, Tranche Three [Member] | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   33.33%