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Statements of Consolidated Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]        
Net income $ 3,680 $ 5,080 $ 3,424 $ 7,818
Other comprehensive income (loss), net of tax        
Foreign currency translation adjustment (431) 2,295 (9,045) 4,125
Recognized net actuarial loss (net of tax provision of $52 and $2 for the three months ended June 30, 2015 and 2014, respectively, and net of tax provision $104 and $3 for the six months ended June 30, 2015 and 2014, respectively) 88 3 174 5
Other comprehensive income (loss), net of tax (343) 2,298 (8,871) 4,130
Comprehensive income (loss) $ 3,337 $ 7,378 $ (5,447) $ 11,948