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STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (UNAUDITED) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Comprehensive Income Net Of Tax [Abstract]        
Net of tax provision on recognized net actuarial loss $ 2 $ 46 $ 3 $ 93