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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

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