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Stock-Based Compensation (Summary Of Stock Options) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Stock-Based Compensation [Abstract]        
Number of Options, Outstanding, Beginning balance     2,437  
Number of Options, Granted 0 65 289 378
Number of Options, Forfeited or expired     (15)  
Number of Options, Outstanding, Ending balance 2,631   2,631  
Number of Options, Exercisable at June 30, 2015 1,847   1,847  
Weighted-Average Exercise Price, Outstanding, Beginning balance     $ 20.07  
Weighted-Average Exercise Price, Granted     23.14  
Weighted-Average Exercise Price, Exercised     18.3  
Weighted-Average Exercise Price, Forfeited or expired     22.83  
Weighted-Average Exercise Price, Outstanding, Ending balance $ 20.45   20.45  
Weighted-Average Exercise Price, Exercisable at June 30, 2015 $ 20.13   $ 20.13  
Weighted-Average Remaining Contractual Term (Years), Outstanding     5 years 1 month 16 days  
Weighted-Average Remaining Contractual Term (Years), Exercisable at March 31, 2015     3 years 3 months 21 days  
Aggregate Intrinsic Value, Outstanding at June 30, 2015 $ 6,614   $ 6,614  
Aggregate Intrinsic Value, Exercisable at June 30, 2015 $ 5,461   $ 5,461