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Statements of Consolidated Comprehensive Income (Loss) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Comprehensive Income Net Of Tax [Abstract]                      
Net income $ 5,100 $ 4,742 $ 2,755 $ 2,658 $ 3,045 $ 206 $ 3,680 $ (256) $ 15,255 $ 6,675 $ 12,861
Other comprehensive income (loss), net of tax:                      
Foreign currency translation adjustment                 (3,579) (19,789) (12,330)
Recognized net actuarial loss                 326 364 10
Gain (loss) on unfunded pension obligations                 35 408 (5,112)
Other comprehensive income (loss), net of tax                 (3,218) (19,017) (17,432)
Comprehensive income (loss)                 $ 12,037 $ (12,342) $ (4,571)