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Statements of Consolidated Comprehensive Income (Unaudited) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]        
Net of tax provision on recognized net actuarial loss $ 2 $ 46 $ 5 $ 140