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DERIVATIVE FINANCIAL INSTRUMENTS (Details) lb in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) lb | Dec. 31, 2017 USD ($) lb | Dec. 31, 2016 USD ($) | Jul. 02, 2016
Interest Rate Swap, Through December 2021 |  |  |  |
Derivative Financial Instruments |  |  |  |
Unrealized gain (losses), net of tax, recorded in AOCI | $ 400,000 |  |  |
Interest Rate Swap, Through December 2021 | Derivative contracts designated as hedging instruments |  |  |  |
Derivative Financial Instruments |  |  |  |
Aggregate notional amount | 260,000,000 |  |  |
Long-term asset to recognize fair value of swaps |  |  | $ 600,000 |
Interest Rate Swap, Through December 2021 | Derivative contracts designated as hedging instruments | Term loan |  |  |  |
Derivative Financial Instruments |  |  |  |
Fixed rate (percentage) |  |  |  | 2.535%
FX Forward Contracts |  |  |  |
Derivative Financial Instruments |  |  |  |
Aggregate notional amount | 10,500,000 | $ 9,000,000 |  |
Unrealized gain (losses), net of tax, recorded in AOCI | 0 | 0 |  |
FX embedded derivatives | Derivative contracts not designated as hedging instruments |  |  |  |
Derivative Financial Instruments |  |  |  |
Aggregate notional amount | 800,000 | 1,100,000 |  |
Commodity Contracts |  |  |  |
Derivative Financial Instruments |  |  |  |
Unrealized gain (losses), net of tax, recorded in AOCI | (100,000) | 800,000 |  |
Fair value of derivative contract - liability | $ 200,000 |  |  |
Fair value of derivative contract - current asset |  | $ 1,100,000 |  |
Commodity Contracts | Derivative contracts designated as hedging instruments |  |  |  |
Derivative Financial Instruments |  |  |  |
Notional amount of commodity contracts (in pounds of copper) | lb | 3.4 | 3.6 |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 + Details
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