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Equity (Stock-Based Compensation Plans - Narrative) (Details) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
2015 Stock Plan        
Equity - Stock-based Compensation Plans [Line Items]        
Aggregate number of shares authorized for issuance   37,344,024    
Other Stock And Incentive Plans        
Equity - Stock-based Compensation Plans [Line Items]        
Deferred shares   1,188,792    
2015 Director Stock Plan        
Equity - Stock-based Compensation Plans [Line Items]        
Aggregate number of shares authorized for issuance   1,660,961    
Other Director Stock Plans        
Equity - Stock-based Compensation Plans [Line Items]        
Deferred shares   246,391    
Stock Options        
Equity - Stock-based Compensation Plans [Line Items]        
Award Expiration Date   10 years 10 years 10 years
Stock Options | Minimum        
Equity - Stock-based Compensation Plans [Line Items]        
Vesting period   1 year    
Stock Options | Maximum        
Equity - Stock-based Compensation Plans [Line Items]        
Vesting period   3 years    
Stock Options | Liability Awards Plan        
Equity - Stock-based Compensation Plans [Line Items]        
Paid   0    
Performance Shares        
Equity - Stock-based Compensation Plans [Line Items]        
Paid   (1,194,283)    
Performance Factor     46.30%  
Performance Shares | Scenario, Forecast        
Equity - Stock-based Compensation Plans [Line Items]        
Paid (1,594,846)      
Performance Shares | Minimum        
Equity - Stock-based Compensation Plans [Line Items]        
Future Performance Factor   0.00%    
Performance Shares | Maximum        
Equity - Stock-based Compensation Plans [Line Items]        
Future Performance Factor   175.00%    
Performance Shares | Liability Awards Plan        
Equity - Stock-based Compensation Plans [Line Items]        
Paid   (186,085)    
Performance Shares | Liability Awards Plan | Scenario, Forecast        
Equity - Stock-based Compensation Plans [Line Items]        
Paid (212,464)      
Restricted Stock Units        
Equity - Stock-based Compensation Plans [Line Items]        
Vesting period   3 years    
Paid   (1,602,483)    
Restricted Stock Units | Liability Awards Plan        
Equity - Stock-based Compensation Plans [Line Items]        
Paid   (362,202)