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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net income $ 206,477 $ 81,272 $ 164,947
Other comprehensive (loss) income, net of tax:      
Foreign currency translation adjustment, net of tax of $0 (8,759)    
Unrealized (losses) gains on marketable securities:      
Unrealized (losses) gains on marketable securities arising during period, net of tax of $(1,667), $1,449, $(216), respectively (3,075) 2,417 (1,097)
Less: Reclassification adjustment for gains included in net income, net of tax of $(390), $(645), $(257), respectively (704) (1,433) (447)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total (3,779) 984 (1,544)
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 $(169), $(169), $(159), respectively [1] (295) (295) (276)
Other comprehensive (loss) income (12,833) 689 (1,820)
Comprehensive income $ 193,644 $ 81,961 $ 163,127
[1] The amortization of prior service benefit is included in the computation of net periodic pension cost and postretirement benefit; see Note M: "Retirement Plans."