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Consolidated Statements of Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Net earnings $ 39,674 $ 73,800 $ 182,464
Defined benefit pension and other postretirement employee benefits:      
Net (loss) gain arising during the period, net of tax benefit (provision) of $15,830, $(11,188), and $4,312 (21,942) 17,499 (6,746)
Prior service credit arising during the period, net of tax provision of $(1,163), $(71), and $ - 1,613 112  
Amortization of actuarial loss included in net periodic cost, net of tax provision of $(3,513), $(4,194), and $(4,053) 4,869 6,560 6,339
Amortization of prior service credit included in net periodic cost, net of tax benefit of $252, $230, and $260 (350) (360) (406)
Foreign currency translation adjustment (874)    
(Amortization) recognition of deferred taxes related to actuarial gain on other postretirement employee benefit obligations (229) 4,799  
Other comprehensive (loss) income, net of tax (16,913) 28,610 (813)
Comprehensive income $ 22,761 $ 102,410 $ 181,651