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ACQUISITIONS (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 31, 2017 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Mar. 31, 2018
Acquisitions |  |  |  |  |  |  |  |  |  |
Business Combination Receivable From Seller |  |  |  |  |  |  |  |  |  | $ 10,983
Sales Revenue, Goods, Net |  |  |  | $ 737,099 |  | $ 669,491 | $ 2,284,847 | $ 1,877,246 |  |
Business Combination, Bargain Purchase, Gain Recognized, Amount |  |  |  | $ 0 |  | $ (51,585) | 0 | (51,585) |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  |  |  | $ (6,591) | $ 72,468 |  |
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 |  |  |  |  |  |  |  |
Business Combination, Bargain Purchase, Gain Recognized, Amount |  | (49,650) | [1] |  | $ 1,935 |  |  |  |  |
Business Combination, Recognized Identifiable Other Assets Acquired and Other Liabilities Assumed, Net | [2] | (27,210) |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  | 135,123 |  |  |  |  |  |  |  |
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] | An adjustment of $1,935 was recorded to the Bargain purchase gain in the fourth quarter of 2017.
[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] | nventories acquired were sold in the third quarter of 2017 resulting in a $2,314 increase in Cost of goods sold for 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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