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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Cash Flow Hedge) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Net after-tax loss included in accumulated other comprehensive earnings | $ 393 | $ (346) |  |
Derivatives in Cash Flow Hedging Relationships |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion) | 6,069 | $ (5,681) |  |
Cross Currency Swap Contract | Derivatives in Cash Flow Hedging Relationships |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Amount hedged |  |  | $ 280,000 |
Net after-tax loss included in accumulated other comprehensive earnings | 2,000 |  |  |
Fair value of derivative asset | 3,600 |  |  |
Cross Currency Swap Contract: Interest Component | Derivatives in Cash Flow Hedging Relationships |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Amount expected to be recognized in earnings in next twelve months related to cross currency swap contract | $ 5,100 |  |  |
Notes payable to banks |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Proceeds from debt |  |  | $ 280,000 |
Interest rate on notes (as a percent) | 1.36% |  | 1.36% | 1.36%

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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