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Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Statement of Other Comprehensive Income [Abstract]    
Amortization of prior service cost included in net periodic benefit cost, income tax expense $ 2 $ 10
Amortization of actuarial net loss included in net periodic benefit cost, income tax expense 794 545
Amortization of transition obligation included in net periodic benefit cost, income tax expense 3 3
Unrealized loss on derivative instruments, income tax benefit    (89)
Reclassification adjustments for losses on derivative instruments included in net income, income tax expense 135 155
Foreign currency translation adjustments, income tax (benefit) expense (674) 472
Unrealized gain on marketable securities, income tax expense    $ 164