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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Apr. 01, 2012
Net income $ 6,589 $ 33,564
Other comprehensive (loss) income:    
Net unrealized gains on marketable securities arising during period 363 744
Less: Reclassification adjustment for net gains included in net income (275) (466)
Net change 88 278
Defined benefit pension and postretirement plans:    
Amortization of prior service benefit included in net periodic pension and postretirement cost (109) [1] (92) [1]
Other comprehensive (loss) income (21) 186
Comprehensive income $ 6,568 $ 33,750
[1] The amortization of prior service benefit is included in the computation of net periodic pension and postretirement benefit costs; see Note M "Retirement Plans."