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Stock Based Compensation (Rollforward of Stock Awards) (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Shares        
Increase in estimated potential share award based on TSR performance (in shares)     26,586  
Unvested and potential stock awards, end of period (in shares) 925,367   925,367  
Weighted-Average Grant Date Fair Value        
Increase in estimated potential share award (in dollars per share)     $ 27.47  
Stock Awards        
Shares        
Unvested and potential stock awards, beginning of period (in shares)     1,045,020  
Unvested and potential stock awards, end of period (in shares) 925,367   925,367  
Weighted-Average Grant Date Fair Value        
Unvested and potential stock awards, beginning of period (in dollars per share)     $ 25.15  
Unvested and potential stock awards, end of period (in dollars per share) $ 24.07   $ 24.07  
Deferred Stock Awards        
Shares        
Deferred stock awards granted (in shares)     242,586  
Stock awards vested (in shares)     (228,478)  
Deferred stock awards forfeited (in shares)     (6,979)  
Weighted-Average Grant Date Fair Value        
Deferred stock awards granted (in dollars per share) $ 0 $ 0 $ 22.39 $ 21.02
Stock awards vested (in dollars per share)     21.05  
Deferred stock awards forfeited (in dollars per share)     $ 21.82  
Performance Share Awards        
Shares        
Stock awards vested (in shares)     (153,368)  
Weighted-Average Grant Date Fair Value        
Stock awards vested (in dollars per share)     $ 30.45