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QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Quarterly financial data (unaudited) |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 684,648 | $ 697,552 | $ 744,045 | $ 727,122 | $ 694,513 | $ 701,624 | $ 699,293 | $ 599,179 | $ 2,853,367 | $ 2,694,609 | $ 2,070,172
Gross profit | 213,032 | 213,362 | 224,997 | 215,265 | 194,343 | 185,452 | 195,504 | 161,438 | 866,656 | 736,737 | 563,819
Income before income taxes | 87,605 | 90,889 | 98,157 | 92,919 | 83,427 | 75,873 | 81,494 | 60,537 | 369,570 | 301,331 | 187,108
Net income | 62,084 | 64,765 | 66,319 | 64,243 | 57,733 | 55,530 | 57,013 | 46,910 | 257,411 | 217,186 | 130,244
Basic earnings per share (in dollars per share) | $ 0.75 | $ 0.78 | $ 0.80 | $ 0.77 | $ 0.69 | $ 0.66 | $ 0.69 | $ 0.56 | $ 3.10 | $ 2.60 | $ 1.54
Diluted earnings per share (in dollars per share) | $ 0.74 | $ 0.77 | $ 0.79 | $ 0.76 | $ 0.68 | $ 0.66 | $ 0.68 | $ 0.55 | $ 3.06 | $ 2.56 | $ 1.53
Rationalization and asset impairment net gains (charges) | (5,037) | (3,059) | (1,258) |  |  |  |  |  | (9,354) | (282) | 384
Rationalization and asset impairment net gains (charges), after-tax | (3,823) | (2,704) | (915) |  |  |  |  |  |  |  |
Asia Pacific Welding |  |  |  |  |  |  |  |  |  |  |
Quarterly financial data (unaudited) |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 324,482 | 376,276 | 324,092
Rationalization and asset impairment net gains (charges) |  |  |  |  |  |  | 75 |  | (3,151) | (93) | (427)
Rationalization and asset impairment net gains (charges), after-tax |  |  |  |  |  |  | 44 |  |  |  |
Europe Welding and Asia Pacific Welding |  |  |  |  |  |  |  |  |  |  |
Quarterly financial data (unaudited) |  |  |  |  |  |  |  |  |  |  |
Rationalization and asset impairment net gains (charges) |  |  |  |  |  |  |  | (357) |  |  |
Rationalization and asset impairment net gains (charges), after-tax |  |  |  |  |  |  |  | (281) |  |  |
North America Welding |  |  |  |  |  |  |  |  |  |  |
Quarterly financial data (unaudited) |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,580,818 | 1,309,499 | 1,013,193
Rationalization and asset impairment net gains (charges) |  |  |  |  |  |  |  |  | (827) |  |
Gain related to a favorable adjustment for tax audit settlements |  |  |  |  |  |  |  | 4,844 |  |  |
South America Welding |  |  |  |  |  |  |  |  |  |  |
Quarterly financial data (unaudited) |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 161,483 | 156,684 | 117,419
Rationalization and asset impairment net gains (charges) |  |  | (1,381) |  |  |  |  |  |  |  |
Rationalization and asset impairment net gains (charges), after-tax |  |  | $ (906) |  |  |  |  |  |  |  |

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