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Share-Based Compensation (Summary of Restricted Stock Unit and Stock Option Activity) (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Stock Options Number of Shares      
Granted (in shares) 165,000 220,000 664,000
Vested/exercised (in shares) 0 0  
Stock Options Weighted Average Exercise/(Strike) Price Per Share      
Vested/exercised, Weighted Average Exercise/(Strike) Price Per Share (in dollars per share) $ 0 $ 0  
Restricted Stock Units      
RSUs Number of Shares      
Outstanding, beginning of period (in shares) 1,715,000 1,469,000 1,397,984
Units granted (in shares) 245,000 530,000 699,000
Expired or cancelled (in shares) (403,750) (104,029) (240,289)
Vested/exercised (in shares) (521,250) (179,971) (387,695)
Outstanding, end of period (in shares) 1,035,000 1,715,000 1,469,000
RSUs Weighted Average Grant Date Fair Value      
Outstanding, beginning of period, Weighted Average Grant Date Fair Value (in dollars per share) $ 25.19 $ 27.27 $ 30.11
Units granted (in dollars per share) 20.67 20.23 24.21
Expired or cancelled, Weighted Average Grant Date Fair Value (in dollars per share) 25.52 28.98 32.76
Vested/exercised, Weighted Average Grant Date Fair Value (in dollars per share) 29.44 25.39 28.67
Outstanding, end of period, Weighted Average Grant Date Fair Value (in dollars per share) $ 21.85 $ 25.19 $ 27.27
Stock Options      
Stock Options Number of Shares      
Outstanding, beginning of period (in shares) 2,279,015 2,943,044 2,554,034
Granted (in shares) 165,000 220,000 664,000
Expired or cancelled (in shares) (168,750) (884,029) (274,990)
Vested/exercised (in shares)     0
Outstanding, end of period (in shares) 2,275,265 2,279,015 2,943,044
Stock Options Weighted Average Exercise/(Strike) Price Per Share      
Outstanding, beginning of period, Weighted Average Exercise/(Strike) Price Per Share (in dollars per share) $ 20.62 $ 20.89 $ 20.45
Granted, Weighted Average Exercise/(Strike) Price Per Share (in dollars per share) 19.24 19.66 23.20
Expired or cancelled, Weighted Average Exercise/(Strike) Price Per Share (in dollars per share) 25.87 21.03 22.82
Vested/exercised, Weighted Average Exercise/(Strike) Price Per Share (in dollars per share)     0
Outstanding, end of period, Weighted Average Exercise/(Strike) Price Per Share (in dollars per share) $ 20.13 $ 20.62 $ 20.89