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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]        
Net Income (Loss) $ (7,670) $ 12,401 $ (18,484) $ 19,052
Other Comprehensive Income (Loss), net of tax        
Net unrealized gains (losses) on available-for-sale securities 104 373 (3,308) 1,708
Net unrealized losses on cash flow hedges   (417)   (338)
Defined benefit plan adjustments 5 86 67 141
Foreign currency translation (3,424) 2,619 (2,582) 3,861
Other Comprehensive Income (Loss), net of tax (3,315) 2,661 (5,823) 5,372
Comprehensive Income (Loss), net of tax $ (10,985) $ 15,062 $ (24,307) $ 24,424