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Benefit Plans (Summary Of Performance Contingent Cash Awards Activity) (Details) - Performance Contingent Cash Awards [Member] - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]    
Nonvested, January 1 (in shares/awards) 163,752 157,860
Granted (in shares/awards) 0 82,210
Vested (in shares/awards) [1] 0 (74,664)
Forfeited (in shares/awards) (3,652) (1,654)
Nonvested, September 30 (in shares/awards) 160,100 163,752
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]   (74,664)
Cash payout value [1]   $ 2.4
[1] In 2015, 74,664 performance-contingent cash awards granted in 2013 vested, resulting in cash payouts valued at $2.4 million.