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Stock Options And Restricted Stock Awards (Summary of Stock Option Activity and Weighted Average Exercise Price) (Details) - $ / shares
shares in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock Options And Restricted Stock Awards [Abstract]      
Options, Outstanding, beginning of period shares 650 684 647
Options, Granted shares 285 40 121
Options, Exercised shares (380) (44) (66)
Options, Forfeited/Cancelled shares (150) (30) (18)
Options, Outstanding, end of period shares 405 650 684
Weighted Average Exercise Price, Outstanding, beginning of period $ 12.70 $ 11.43 $ 8.80
Weighted Average Exercise Price, Granted 20.03 26.49 22.97
Weighted Average Exercise Price, Exercised 8.77 8.51 6.90
Weighted Average Exercise Price, Forfeited/Cancelled 17.40 10.53 9.26
Weighted Average Exercise Price, Outstanding, end of period $ 19.71 $ 12.70 $ 11.43