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CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net (loss) income $ (43,421) $ 206,477 $ 81,272
Other comprehensive (loss) income, net of tax:      
Foreign currency translation adjustment, net of tax of $0, $0, $0 (13,162) (8,759)  
Unrealized gains (losses) on marketable securities:      
Unrealized gains (losses) on marketable securities arising during period, net of tax of $923, $(1,667), $1,449, respectively 2,037 (3,075) 2,417
Less: Reclassification adjustment for gains included in net (loss) income, net of tax of $(255), $(390), $(645), respectively (683) (704) (1,433)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total 1,354 (3,779) 984
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 of $(190), $(169), $(169), respectively (321) (295) (295)
Prior service income arising during period, net of tax of $34, $0, $0, respectively 59    
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax (262) (295) (295)
Other comprehensive (loss) income (12,070) (12,833) 689
Comprehensive (loss) income $ (55,491) $ 193,644 $ 81,961