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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net income (loss) $ 257,692 $ (43,421) $ 206,477
Other comprehensive income (loss), net of tax:      
Foreign currency translation adjustment, net of tax of $0, $0, $0 37,840 (13,162) (8,759)
Available-for-sale marketable securities:      
Unrealized gains (losses) on marketable securities arising during period, net of tax of $1,903, $923, $(1,667), respectively 1,863 2,037 (3,075)
Less: Reclassification adjustment for gains included in net income (loss), net of tax of $(297), $(255), $(390), respectively (441) (683) (704)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total 1,422 1,354 (3,779)
Defined benefit pension and post-retirement plans:      
Amortization of prior service (credit) cost included in net periodic pension and post-retirement expense/income, net of tax $(154), $(190), $(169), respectively (272) (321) (295)
Prior service income arising during period, net of tax of $0, $34, $0, respectively   59  
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax (272) (262) (295)
Other comprehensive income (loss) 38,990 (12,070) (12,833)
Comprehensive income (loss) $ 296,682 $ (55,491) $ 193,644