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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]        
Net Income $ 12,401 $ 10,228 $ 19,052 $ 15,242
Other Comprehensive Income (Loss), net of tax:        
Net unrealized gains (losses) on available-for-sale securities 373 (165) 1,708 (420)
Net unrealized losses on cash flow hedges (417)   (338)  
Defined benefit plan adjustments 86 22 141 67
Foreign currency translation 2,619 (601) 3,861 627
Other Comprehensive Income (Loss), net of tax 2,661 (744) 5,372 274
Comprehensive Income, net of tax $ 15,062 $ 9,484 $ 24,424 $ 15,516