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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]        
Net Income (Loss) $ 7,589 $ 15,898 $ (10,895) $ 34,950
Other Comprehensive Income (Loss), net of tax        
Net unrealized gains (losses) on available-for-sale securities (32) 804 (3,340) 2,512
Net unrealized gains (losses) on cash flow hedges   142   (196)
Defined benefit plan adjustments 37 73 104 214
Foreign currency translation (451) 1,541 (3,033) 5,402
Other Comprehensive Income (Loss), net of tax (446) 2,560 (6,269) 7,932
Comprehensive Income (Loss), net of tax $ 7,143 $ 18,458 $ (17,164) $ 42,882