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Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands | Total | Capital stock | Capital in excess of par value | Retained earnings | Retained earnings Cumulative Effect, Period of Adoption, Adjustment | Foreign currency translation | Defined benefit pension plans | Unrealized holding gain (loss) on available-for-sale securities | Accumulated other comprehensive (loss) income | Treasury stock
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Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |  |  |
Balance at the beginning of the year at Dec. 31, 2017 |  | $ 2,631 | $ 660,894 | $ 5,002,419 |  | $ (251,909) | $ (177,371) | $ 104 |  | $ (1,209,135)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Shares issued |  | 9 |  |  |  |  |  |  |  |
Issuance of common stock under employee stock plans |  |  | 18,534 |  |  |  |  |  |  | 6,629
Share-based compensation costs |  |  | 27,315 |  |  |  |  |  |  |
Net income | $ 777,933 |  |  | 777,933 |  |  |  |  |  |
Cash dividends paid |  |  |  | (128,911) |  |  |  |  |  |
Other |  |  |  | 2,370 |  |  |  |  |  |
Translation adjustments | (72,112) |  |  |  |  | (72,112) |  |  |  |
Change in long-term intercompany notes |  |  |  |  |  | (16,569) |  |  |  |
Net investment hedge instruments (loss) gain, net of tax of $14,787, $581 and ($12,384) in 2020, 2019 and 2018, respectively | (38,452) |  |  |  |  | 38,452 |  |  |  |
Net actuarial loss, net of tax of $8,637, $767 and ($18,825) in 2020, 2019 and 2018, respectively | (75,253) |  |  |  |  |  | (75,253) |  |  |
Amortization of net actuarial loss, net of tax of ($3,539), ($3,505) and ($2,716) in 2020, 2019 and 2018, respectively | 9,313 |  |  |  |  |  | 9,313 |  |  |
Amortization of prior service costs, net of tax of $7, ($83) and $1,154 in 2020, 2019 and 2018, respectively | (5,639) |  |  |  |  |  | (5,639) |  |  |
Increase (decrease) during the year, net of tax | (104) |  |  |  |  |  |  | (104) |  |
Purchase of treasury stock |  |  |  |  |  |  |  |  |  | (367,678)
Balance at the end of the year at Dec. 31, 2018 | $ 4,241,922 | 2,640 | 706,743 | 5,653,811 | $ 0 | (302,138) | (248,950) | 0 | $ (551,088) | (1,570,184)
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Shares issued |  | 22 |  |  |  |  |  |  |  |
Issuance of common stock under employee stock plans |  |  | 85,684 |  |  |  |  |  |  | 7,644
Share-based compensation costs |  |  | 40,394 |  |  |  |  |  |  |
Net income | $ 861,297 |  |  | 861,297 |  |  |  |  |  |
Cash dividends paid |  |  |  | (127,496) |  |  |  |  |  |
Other |  |  |  | 0 |  |  |  |  |  |
Translation adjustments | 23,692 |  |  |  |  | 23,692 |  |  |  |
Change in long-term intercompany notes |  |  |  |  |  | (5,999) |  |  |  |
Net investment hedge instruments (loss) gain, net of tax of $14,787, $581 and ($12,384) in 2020, 2019 and 2018, respectively |  |  |  |  |  | (1,803) |  |  |  |
Net actuarial loss, net of tax of $8,637, $767 and ($18,825) in 2020, 2019 and 2018, respectively | (10,522) |  |  |  |  |  | (10,522) |  |  |
Amortization of net actuarial loss, net of tax of ($3,539), ($3,505) and ($2,716) in 2020, 2019 and 2018, respectively | 12,180 |  |  |  |  |  | 12,180 |  |  |
Amortization of prior service costs, net of tax of $7, ($83) and $1,154 in 2020, 2019 and 2018, respectively | 401 |  |  |  |  |  | 401 |  |  |
Increase (decrease) during the year, net of tax | 0 |  |  |  |  |  |  | 0 |  |
Purchase of treasury stock | (11,900) |  |  |  |  |  |  |  |  | (11,924)
Balance at the end of the year at Dec. 31, 2019 | $ 5,115,492 | 2,662 | 832,821 | 6,387,612 | 0 | (286,248) | (246,891) | 0 | (533,139) | (1,574,464)
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Shares issued |  | 14 |  |  |  |  |  |  |  |
Issuance of common stock under employee stock plans |  |  | 47,366 |  |  |  |  |  |  | 13,879
Share-based compensation costs |  |  | 41,565 |  |  |  |  |  |  |
Net income | $ 872,439 |  |  | 872,439 |  |  |  |  |  |
Cash dividends paid |  |  |  | (165,035) |  |  |  |  |  |
Other |  |  |  | 0 |  |  |  |  |  |
Translation adjustments | 64,521 |  |  |  |  | 64,521 |  |  |  |
Change in long-term intercompany notes |  |  |  |  |  | 16,695 |  |  |  |
Net investment hedge instruments (loss) gain, net of tax of $14,787, $581 and ($12,384) in 2020, 2019 and 2018, respectively |  |  |  |  |  | (45,716) |  |  |  |
Net actuarial loss, net of tax of $8,637, $767 and ($18,825) in 2020, 2019 and 2018, respectively | (18,733) |  |  |  |  |  | (18,733) |  |  |
Amortization of net actuarial loss, net of tax of ($3,539), ($3,505) and ($2,716) in 2020, 2019 and 2018, respectively | 11,940 |  |  |  |  |  | 11,940 |  |  |
Amortization of prior service costs, net of tax of $7, ($83) and $1,154 in 2020, 2019 and 2018, respectively | (36) |  |  |  |  |  | (36) |  |  |
Increase (decrease) during the year, net of tax | 0 |  |  |  |  |  |  | 0 |  |
Purchase of treasury stock | (4,700) |  |  |  |  |  |  |  |  | (4,685)
Balance at the end of the year at Dec. 31, 2020 | $ 5,949,346 | $ 2,676 | $ 921,752 | $ 7,094,656 | $ (360) | $ (250,748) | $ (253,720) | $ 0 | $ (504,468) | $ (1,565,270)

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