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Statements of Consolidated Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Comprehensive Income Net Of Tax [Abstract]        
Net income $ 4,156 $ 2,755 $ 5,674 $ 5,413
Other comprehensive income (loss), net of tax        
Foreign currency translation adjustment 2,810 (1,855) 8,282 2,012
Recognized net actuarial gain (net of tax provision of $49 and $46 for the three months ended June 30, 2017 and 2016, respectively, and net of tax provision of $93 and $92 for the six months ended June 30, 2017 and 2016, respectively.) 83 76 155 153
Other comprehensive income (loss), net of tax 2,893 (1,779) 8,437 2,165
Comprehensive income $ 7,049 $ 976 $ 14,111 $ 7,578