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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
shares in Thousands, $ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Statement Of Financial Position [Abstract]    
Allowances for doubtful accounts (in dollars) $ 2,124 $ 2,339
Ordinary share, par value (in dollars per share) $ 0.00375 $ 0.00375
Ordinary share, authorized shares 250,000 250,000
Ordinary share, shares issued 39,799 39,363
Ordinary share, shares outstanding 35,318 35,506
Treasury shares 4,481 3,857