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Statements of Consolidated Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]        
Net income $ 206 $ 2,555 $ 3,630 $ 10,373
Other comprehensive loss, net of tax        
Foreign currency translation adjustment (10,001) (9,813) (19,046) (5,688)
Recognized net actuarial loss (net of tax provision of $59 and $2 for the three months ended September 30, 2015 and 2014, respectively, and net of tax provision $164 and $5 for the nine months ended September 30, 2015 and 2014, respectively) 99 2 273 7
Other comprehensive loss, net of tax (9,902) (9,811) (18,773) (5,681)
Comprehensive income (loss) $ (9,696) $ (7,256) $ (15,093) $ 4,692