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STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (LOSS) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Comprehensive Income Net Of Tax [Abstract]        
Net of tax provision on recognized net actuarial loss $ 46 $ 75 $ 93 $ 142