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Incentive Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2019
Mar. 31, 2019
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Threshold of deductible compensation for executive officers     $ 1.0
2012 Long-Term Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares available for issuance     6,750,000
Maximum number of shares available for issuance, annual rate     1.00%
Performance-Based RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants in period   957,600  
Performance-Based RSUs | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value per share at grant date   $ 28.09  
Time-Based RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants in period   327,900  
Fair value per share at grant date $ 28.16    
Time-Based RSUs | Director | Non-Employee Director Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants in period 78,716    
Fair value per share at grant date $ 27.95    
Cash-Settled RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants in period 1,025,900