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ACQUISITIONS (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Acquisitions |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory |  |  |  |  |  | $ 4,578 |
Business Combination Receivable From Seller |  |  |  | $ 10,983 |  |  |
Sales Revenue, Goods, Net |  |  |  | 757,696 | $ 580,897 |  |
Business Combination, Bargain Purchase, Gain Recognized, Amount |  |  |  |  |  | (49,650) |
Special Items Charge (Gain) | [1] |  |  | 12,840 | 3,615 |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  | (6,235) | 0 |  |
Air Liquide Welding [Member] |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  | $ 89,442 |  |  |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) |  | 7,099 |  |  |  |  |
Sales Revenue, Goods, Net |  |  |  | 107,000 |  |  | $ 400,000
Business Combination, Bargain Purchase, Gain Recognized, Amount |  | (49,650) |  |  |  |  |
Business Combination, Recognized Identifiable Other Assets Acquired and Other Liabilities Assumed, Net | [2] | (27,210) |  |  |  |  |
Business Combination, Consideration Transferred |  | 135,123 |  |  |  |  |
Special Items Charge (Gain) |  |  |  | $ 1,907 | $ 3,615 |  |
Payments to Acquire Businesses, Net of Cash Acquired |  | 61,953 | [3] |  |  | $ 61,953 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory | [4] | 97,803 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | [5] | 73,056 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | [6] | 11,715 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  | (65,640) |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Pension Liability |  | $ (67,563) |  |  |  |  |
Trademarks and Trade Names [Member] | Air Liquide Welding [Member] |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 10 years |  |  |  |  |
Other Intangible Assets, Net |  | $ 1,183 |  |  |  |  |
Other Intangible Assets [Member] | Air Liquide Welding [Member] |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 9 years |  |  |  |  |
Other Intangible Assets, Net |  | $ 3,433 |  |  |  |  |
[1] | In the three months ended March 31, 2018, special items reflect pension settlement charges in Americas Welding, rationalization and asset impairment charges in International Welding and transaction and integration costs in Corporate / Eliminations related to the Air Liquide Welding acquisition as discussed in Note 4. In the three months ended March 31, 2017, special items in Corporate / Eliminations reflect transaction and integration costs related to the Air Liquide Welding acquisition.
[2] | Consists primarily of other accrued liabilities.
[3] | Reflects a receivable from seller for an agreed upon purchase price adjustment. The payment of $10,983 was received in the first quarter of 2018.
[4] | Inventories acquired were sold in 2017 resulting in a $4,578 increase in Cost of goods sold for the year ended December 31, 2017 related to the amortization of step up in the value of acquired inventories.
[5] | Property, plant and equipment acquired includes a number of manufacturing and distribution sites, including the related facilities, land and leased sites, and machinery and equipment for use in manufacturing operations.
[6] | $7,099 of the intangible asset balance was assigned to a trade name expected to have an indefinite life. Of the remaining amount, $1,183 was assigned to a finite-lived trade name (10 year weighted average useful life) and $3,433 was assigned to other intangible assets (9 year weighted average life).

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