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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventories (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 30, 2017
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Accounting Policies [Abstract] |  |  |
Inventory valued at the lower of cost, determined on the last-in, first-out (LIFO) method, or market (as a percent) | 37.00% |  | 37.00%
Excess of replacement cost of inventories over the LIFO value | $ 44,808 |  | $ 43,727
Inventory, Net [Abstract] |  |  |
Raw materials and purchased parts | 176,554 |  | 183,029
Work-in-process | 20,197 |  | 30,671
Finished goods and manufactured goods | 218,062 |  | 250,975
Subtotal | 414,813 |  | 464,675
Less: LIFO reserve | 44,808 |  | 43,727
Net inventory | $ 370,005 | $ 384,705 | $ 420,948

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- Definition The excess of replacement or current cost over the stated LIFO (last in first out) inventory value when the LIFO inventory method is utilized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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