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Benefit Plans (Summary Of Performance Contingent Cash Awards Activity) (Details) - Performance Contingent Cash Awards [Member] - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]    
Nonvested, January 1 (in shares/awards) 81,876 78,930
Granted (in shares/awards) 0 41,105
Vested (in shares/awards) [1] 0 (37,332)
Forfeited (in shares/awards) (382) (469)
Nonvested, March 31 (in shares/awards) 81,494 82,234
2013 Grant [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]    
Vested (in shares/awards) [1]   (37,332)
Cash payout value [1]   $ 2.4
[1] In 2015, 37,332 performance-contingent cash awards granted in 2013 vested, resulting in cash payouts valued at $2.4 million.