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Share-Based Compensation (Summary of Restricted Stock Unit and Stock Option Activity) (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stock Options Number of Shares      
Vested/exercised (in shares) 0    
Restricted Stock Units [Member]      
RSUs Number of Shares      
Outstanding, beginning of period (in shares) 1,397,984 1,156,484 725,597
Granted (in shares) 699,000 1,064,000 483,387
Expired or cancelled (in shares) (240,289) (20,985)  
Vested/exercised (in shares) (387,695) (801,515) (52,500)
Outstanding, end of period (in shares) 1,469,000 1,397,984 1,156,484
Weighted Average Grant Date Fair Value      
Outstanding, beginning of period, Weighted Average Grant Date Fair Value (in dollars per share) $ 30.11 $ 22.64 $ 25.28
Granted, Weighted Average Grant Date Fair Value (in dollars per share) 24.21 30.02 19.14
Expired or cancelled, Weighted Average Grant Date Fair Value (in dollars per share) 32.76 23.91  
Vested/exercised, Weighted Average Grant Date Fair Value (in dollars per share) 28.67 19.38 18.74
Outstanding, end of period, Weighted Average Grant Date Fair Value (in dollars per share) $ 27.27 $ 30.11 $ 22.64
Stock Options [Member]      
Stock Options Number of Shares      
Outstanding, beginning of period (in shares) 2,554,034 2,174,500 1,998,000
Granted (in shares) 664,000 539,000 274,000
Expired or cancelled (in shares) (274,990) (19,466)  
Vested/exercised (in shares)   (140,000) (97,500)
Outstanding, end of period (in shares) 2,943,044 2,554,034 2,174,500
Weighted Average Exercise/(Strike) Price Per Share      
Outstanding, beginning of period, Weighted Average Exercise/(Strike) Price Per Share (in dollars per share) $ 20.45 $ 19.50 $ 19.62
Granted, Weighted Average Exercise/(Strike) Price Per Share (in dollars per share) 23.20 24.54 16.20
Expired or cancelled, Weighted Average Exercise/(Strike) Price Per Share (in dollars per share) 22.82 26.56  
Vested/exercised, Weighted Average Exercise/(Strike) Price Per Share (in dollars per share)   21.41 12.72
Outstanding, end of period, Weighted Average Exercise/(Strike) Price Per Share (in dollars per share) $ 20.89 $ 20.45 $ 19.50