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Statements of Consolidated Comprehensive Income (Loss) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]                      
Net income $ 3,045 $ 206 $ 3,680 $ (256) $ 2,488 $ 2,555 $ 5,080 $ 2,738 $ 6,675 $ 12,861 $ 20,587
Other comprehensive income (loss), net of tax:                      
Foreign currency translation adjustment                 (19,789) (12,330) (8,457)
Recognized net actuarial loss                 364 10 306
Gain (loss) on unfunded pension obligations                 408 (5,112) 4,113
Other comprehensive income (loss), net of tax                 (19,017) (17,432) (4,038)
Comprehensive income (loss)                 $ (12,342) $ (4,571) $ 16,549