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QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly financial data (unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales | $ 736,307 |  | $ 730,783 |  | $ 777,008 |  | $ 759,174 |  | $ 743,827 |  | $ 737,099 |  | $ 790,052 |  | $ 757,696 |  | $ 3,003,272 | $ 3,028,674 | $ 2,624,431
Acquisition Transaction and Integration Costs |  |  |  |  | 1,014 |  | 790 |  | 833 |  | 970 |  | 788 |  | 1,907 |  | 1,804 | 4,498 | 15,002
Business Combination, Bargain Purchase, Gain Recognized, Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 49,650
Gross profit | 240,934 |  | 238,351 |  | 269,881 |  | 258,421 |  | 250,299 |  | 251,552 |  | 270,116 |  | 256,554 |  | 1,007,587 | 1,028,521 | 875,107
Income before income taxes | 80,294 | [1] | 91,797 | [2] | 103,484 | [3] | 92,918 | [4] | 94,455 | [1] | 95,744 | [2] | 94,263 | [3] | 84,198 | [4] | 368,493 | 368,660 | 366,236
Net income | $ 63,716 | [1] | $ 72,461 | [2] | $ 85,452 | [3] | $ 71,480 | [4] | $ 86,839 | [1] | $ 70,539 | [2] | $ 68,864 | [3] | $ 60,824 | [4] | $ 293,109 | $ 287,066 | $ 247,503
Basic earnings per share (in dollars per share) | $ 1.04 | [5] | $ 1.18 | [5] | $ 1.37 | [5] | $ 1.13 | [5] | $ 1.36 | [5] | $ 1.09 | [5] | $ 1.05 | [5] | $ 0.93 | [5] | $ 4.73 | $ 4.42 | $ 3.76
Diluted earnings per share (in dollars per share) | $ 1.03 | [5] | $ 1.17 | [5] | $ 1.36 | [5] | $ 1.12 | [5] | $ 1.35 | [5] | $ 1.07 | [5] | $ 1.04 | [5] | $ 0.92 | [5] | $ 4.68 | $ 4.37 | $ 3.71
Rationalization and asset impairment net gains (charges) | $ (8,851) |  | $ (1,495) |  | $ (1,307) |  | $ (3,535) |  | $ (932) |  | $ (2,636) |  | $ (11,542) |  | $ (10,175) |  | $ (15,188) | $ (25,285) | $ (6,590)
Rationalization and asset impairment net gains (charges), after-tax | $ (7,284) |  | (1,240) |  | (937) |  | (2,814) |  | 841 |  | (2,575) |  | (10,362) |  | (7,870) |  |  |  |
Resolution and settlements to uncertain tax positions |  |  |  |  | 4,852 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense Benefit Net Resulting from Tax Reform Act |  |  |  |  |  |  |  |  | (4,424) |  | 2,323 |  |  |  | 2,500 |  | 0 | 399 | 28,616
Acquisition Transaction and Integration Costs Net of Tax |  |  |  |  | 867 |  | $ 698 |  | 690 |  | 797 |  | $ 675 |  | 1,520 |  |  |  |
Gain (Loss) on Disposition of Assets |  |  |  |  | 3,554 |  |  |  |  |  |  |  |  |  |  |  |  |  |
GainLossOnDispositionofAssets1NetofTax |  |  |  |  | 2,586 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment |  |  |  |  |  |  |  |  | (1,696) |  | (4,232) |  |  |  | (758) |  |  |  |
Defined Benefit Plan Recognized Net Gain (Loss) Due To Settlements Net Of Tax |  |  |  |  |  |  |  |  | $ (1,272) |  | $ (3,176) |  |  |  | $ (569) |  |  |  |
Business Combination, Inventory Step Up |  |  | 1,609 |  | 1,399 |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,578
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain (Loss), Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,601 | 0 | 0
Business Combination, Inventory Step Up Net of Tax |  |  |  |  | $ 1,049 |  |  |  |  |  |  |  |  |  |  |  |  |  |
International Welding [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly financial data (unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 854,376 | 919,771 | 724,024
Rationalization and asset impairment net gains (charges) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (11,702) | (25,285) | (5,498)
Gain (Loss) on Disposition of Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,554 |  |
Business Combination, Inventory Step Up |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,609 |  | 4,578
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain (Loss), Net |  |  | $ 7,601 |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,601 |  |
Americas Welding [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly financial data (unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,815,746 | 1,806,514 | 1,609,779
Rationalization and asset impairment net gains (charges) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,716) |  |
Goodwill, Impairment Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,091
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (6,686) | $ (8,150)
Business Combination, Inventory Step Up |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,399 |  |
[1] | 2019 includes special item charges of $8,851 ($7,284 after-tax) for Rationalization and asset impairment charges. 2018 includes special item charges of $1,696 ($1,272 after-tax) for pension settlement charges, $932 ($841 gain after-tax) for Rationalization and asset impairment charges and gains or losses on the disposal of assets, a $4,424 credit related to the U.S. Tax Act and acquisition-related items including $833 ($690 after-tax) for acquisition transaction and integration costs.
[2] | 2019 includes special item charges of $1,495 ($1,240 after-tax) for Rationalization and asset impairment charges, $1,609 for amortization of step up in value of acquired inventories and $7,601 for a gain on change in control related to the acquisition of Askaynak. 2018 includes special item charges of $4,232 ($3,176 after-tax) for pension settlement charges, $2,636 ($2,575 after-tax) for Rationalization and asset impairment charges, an adjustment to taxes on unremitted foreign earnings related to the U.S. Tax Act of $2,323 and acquisition-related items including $970 ($797 after-tax) for acquisition transaction and integration costs.
[3] | 2019 includes special item charges of $3,554 ($2,586 after-tax) for gains on the disposal of assets, $1,399 ($1,049 after-tax) for amortization of step up in value of acquired inventories, $1,014 ($867 after-tax) for acquisition transaction and integration costs, $1,307 ($937 after-tax) for Rationalization and asset impairment charges and $4,852 for the settlement of a tax item as well as tax deductions associated with an investment in a subsidiary. 2018 includes special item charges of $11,542 ($10,362 after-tax) for Rationalization and asset impairment charges and $788 ($675 after-tax) for acquisition transaction and integration costs.
[4] | 2019 includes special item charges of $3,535 ($2,814 after-tax) for Rationalization and asset impairment charges and $790 ($698 after-tax) for acquisition transaction and integration costs. 2018 includes special item charges of $758 ($569 after-tax) for pension settlement charges, $10,175 ($7,870 after-tax) for Rationalization and asset impairment charges, an adjustment to taxes on unremitted foreign earnings related to the U.S. Tax Act of $2,500 and $1,907 ($1,520 after-tax) for acquisition transaction and integration costs.
[5] | The quarterly earnings per share ("EPS") amounts are each calculated independently. Therefore, the sum of the quarterly EPS amounts may not equal the annual totals.

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