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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]      
Net income $ 222,557 $ 184,238 $ 173,454
Other comprehensive income (loss):      
Foreign currency translation adjustments 1,295 3,867 (4,363)
Income tax effect (500) (1,520) 1,711
Foreign currency translation adjustments, net 795 2,347 (2,652)
Unrealized gains (losses) on cash flow hedges 1,364 1,742 (2,445)
Income tax effect (524) (691) 957
Unrealized gains (losses) on cash flow hedges, net 840 1,051 (1,488)
Unrealized gains (losses) on available-for-sale securities (5)   (11)
Income tax effect 2   4
Unrealized gains (losses) on available-for-sale securities, net (3)   (7)
Pension and other post-retirement adjustments 624 (1,434) (145)
Income tax effect (110) 334 41
Pension and other post-retirement adjustments, net 514 (1,100) (104)
Other comprehensive income (loss), net of tax 2,146 2,298 (4,251)
Comprehensive income $ 224,703 $ 186,536 $ 169,203