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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Foreign currency translation adjustments, deferred income taxes $ 3,471 $ (13,670) $ (2,314)
Net gains (losses) on cash flow hedging instruments, deferred income taxes (759) (544) (975)
Pension liability adjustments, deferred income taxes (4,084) 34 1,443
Unrealized gain (loss) on marketable securities, deferred income taxes $ (12) $ (16) $ 10