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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net income (loss) $ 451,779 $ 257,692 $ (43,421)
Other comprehensive (loss) income, net of tax:      
Foreign currency translation adjustment, net of tax of $0, $0, $0 (28,442) 37,840 (13,162)
Available-for-sale marketable securities:      
Unrealized (losses) gains on marketable securities arising during period, net of tax of $(722), $1,903, $923, respectively (2,110) 1,863 2,037
Less: Reclassification adjustment for losses (gains) included in net income, net of tax of $(255), $(297), $(21) respectively 1,337 (441) (683)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total (773) 1,422 1,354
Defined benefit pension and post-retirement plans:      
Amortization of prior service benefit included in net periodic pension and post-retirement benefit, net of tax $(71), $(154), $(190), respectively (245) (272) (321)
Prior service benefit arising during period, net of tax of $0, $0, $34, respectively     59
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax (245) (272) (262)
Other comprehensive (loss) income (29,460) 38,990 (12,070)
Comprehensive income (loss) $ 422,319 $ 296,682 $ (55,491)