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Stock Options And Restricted Stock Awards (Summary of Status of Unvested Restricted Stock Awards Outstanding) (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted Stock Awards, Unvested restricted stock awards at beginning of period 84 79 70
Restricted Stock Awards, Awarded 108 58 36
Restricted Stock Awards, Vested (20) (38) (22)
Restricted Stock Awards, Forfeited (69) (15) (5)
Restricted Stock Awards, Unvested restricted stock awards at end of period 103 84 79
Restricted Stock Awards, Weighted Average Grant Date Fair Value beginning of period $ 18.91 $ 15.16 $ 9.13
Restricted Stock Awards, Weighted Average Grant Date Fair Value, Awarded 21.14 23.32 22.75
Restricted Stock Awards, Weighted Average Grant Date Fair Value, Vested 24.12 17.02 10.34
Restricted Stock Awards, Weighted Average Grant Date Fair Value, Forfeited 17.17 21.46 6.66
Restricted Stock Awards, Weighted Average Grant Date Fair Value end of period $ 20.84 $ 18.91 $ 15.16