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Consolidated Statements Of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Statement of Other Comprehensive Income [Abstract]      
Net income $ 67,835 $ 66,547 $ 239,593
Pension plans and other postretirement benefits:      
Amortization of prior service cost included in net periodic benefit cost, net of income tax expense of $2 in 2013 and $10 in 2012 2 [1] 5 [1]  
Amortization of actuarial net loss included in net periodic benefit cost, net of income tax expense of $794 in 2013 and $545 in 2012 1,363 [1] 1,031 [1]  
Amortization of transition obligation included in net periodic benefit cost, net of income tax expense of $3 in 2013 and 2012 10 [1] 10 [1]  
Total pension plans and other postretirement benefits 1,375 1,046 (19,723)
Derivative instruments:      
Unrealized loss on derivative instruments, net of income tax benefit of $89 in 2012 0 (139) (330)
Reclassification adjustments for losses on derivative instruments included in net income, net of income tax expense of $135 in 2013 and $155 in 2012 213 244 893
Total derivative instruments 213 105 563
Foreign currency translation adjustments, net of income tax (benefit) expense of ($674) in 2013 and $472 in 2012 (18,280) 6,669 7,567
Unrealized gain on marketable securities, net of income tax expense of $164 in 2012 0 265 676
Other comprehensive (loss) income (16,692) 8,085 (11,957)
Comprehensive income $ 51,143 $ 74,632  
[1] (a) These components of accumulated other comprehensive loss are included in the computation of net periodic benefit cost. See Note 4 in this Form 10-Q and Note 19 in our 2012 Annual Report for further information.