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Stock-Based Compensation (Summary of Restricted Stock Unit and Stock Option Activity) (Details) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restricted Stock Units [Member]      
RSUs Number of Shares      
Outstanding, beginning of period (in shares) 1,156,484 725,597 1,056,597
Granted (in shares) 1,064,000 483,387 321,500
Expired or forfeited/cancelled (in shares) (20,985)   (281,560)
Vested/exercised (in shares) (801,515) (52,500) (370,940)
Outstanding, end of period (in shares) 1,397,984 1,156,484 725,597
Weighted Average Grant Date Fair Value      
Outstanding, beginning of period, Weighted Average Grant Date Fair Value (in dollars per share) $ 22.64 $ 25.28 $ 26.54
Granted, Weighted Average Grant Date Fair Value (in dollars per share) 30.02 19.14 23.07
Expired or forfeited/cancelled, Weighted Average Grant Date Fair Value (in dollars per share) 23.91   23.89
Vested/exercised, Weighted Average Grant Date Fair Value (in dollars per share) 19.38 18.74 27.07
Outstanding, end of period, Weighted Average Grant Date Fair Value (in dollars per share) $ 30.11 $ 22.64 $ 25.28
Stock Options [Member]      
Stock Options Number of Shares      
Outstanding, beginning of period (in shares) 2,174,500 1,998,000 1,989,000
Granted (in shares) 539,000 274,000 259,000
Expired or forfeited/cancelled (in shares) (19,466)   (250,000)
Vested/exercised (in shares) (140,000) (97,500)  
Outstanding, end of period (in shares) 2,554,034 2,174,500 1,998,000
Weighted Average Exercise/(Strike) Price Per Share      
Outstanding, beginning of period, Weighted Average Exercise/(Strike) Price Per Share (in dollars per share) $ 19.50 $ 19.62 $ 19.63
Granted, Weighted Average Exercise/(Strike) Price Per Share (in dollars per share) 24.54 16.20 16.07
Expired or forfeited/cancelled, Weighted Average Exercise/(Strike) Price Per Share (in dollars per share) 26.56   15.97
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) $ 20.45 $ 19.50 $ 19.62