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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
Net income $ 450,003 $ 461,443 $ 432,968
Foreign currency translation 11,843 17,279 (12,644)
Unrealized gains (losses) on investments before reclassifications 134 (27) (1,604)
Amounts reclassified to other expense for unrealized gains (losses) on investments 1,575    
Amounts reclassified to selling and administrative expenses for unrealized gains (losses) on investments   (968) 2,570
Unrealized gains (losses) on investments before income taxes 1,709 (995) 966
Income tax (expense) benefit on unrealized gains (losses) on investments (639) 348 (339)
Unrealized gains (losses) on investments, net of tax 1,070 (647) 627
Retirement liability adjustment before reclassifications 27,888 (14,147) (20,511)
Retirement liability amounts reclassified to selling and administrative expenses 3,678 3,055 1,676
Retirement liability adjustment 31,566 (11,092) (18,835)
Income tax (expense) benefit on retirement liability adjustment (12,205) 4,120 6,592
Retirement liability adjustment, net of tax 19,361 (6,972) (12,243)
Other comprehensive income (loss) 32,274 9,660 (24,260)
Comprehensive income $ 482,277 $ 471,103 $ 408,708