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Retirement And Other Employee Benefits (Effect Of One Percent Change In Assumed Health Care Cost) (Details) - Retirement Health Benefits - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Effect on total of service and interest cost components $ 38 $ 39 $ 43
Effect on postretirement benefit obligation 622 646 601
Effect on total of service and interest cost components (59) (60) (66)
Effect on postretirement benefit obligation $ (908) $ (933) $ (884)