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Benefit Plans (Summary Of Performance Contingent Cash Awards Activity) (Details) - Performance Contingent Cash Awards [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Nonvested, January 1 (in shares/awards) 163,752 157,860 193,954
Granted (in shares/awards) 0 82,210 84,892
Vested (in shares/awards) [1] 0 (74,664) (111,034)
Forfeited (in shares/awards) (3,652) (1,654) (9,952)
Nonvested, December 31 (in shares/awards) 160,100 163,752 157,860
2013 Grant [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Vested (in shares/awards)   (74,664)  
Cash payout value   $ 2.4  
2012 Grant [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Vested (in shares/awards)     (69,532)
Cash payout value     $ 1.9
2011 Grant [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Vested (in shares/awards)     (41,502)
Cash payout value     $ 1.1
[1] In 2015, 74,664 performance-contingent cash awards granted in 2013 vested, resulting in cash payouts valued at $2.4 million. In 2014, 69,532 and 41,502 performance-contingent cash awards granted in 2012 and 2011 vested, resulting in cash payouts valued at $1.9 million and $1.1 million, respectively.