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COMMITMENTS AND CONTINGENCIES - Narrative (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 USD ($) office | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) plaintiff claim | Sep. 30, 2018 USD ($)
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Period to provide free services |  |  | 24 months |
Extension of period to provide free services |  | 12 months |  |
Product liability | $ | $ 11,200,000 | $ 12,700,000 |  |
Maximum potential future payments | $ | 0 |  |  |
Accruals related to guarantees and indemnities | $ | $ 0 | $ 0 |  |
Indian Tribes and Nations |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Pending claims | claim |  |  | 3 |
Maximum |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Debt instrument, term (or less) | 1 year |  |  |
United States |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Pending claims | claim |  |  | 1,000 |
Number of plaintiffs | plaintiff |  |  | 2,500 |
Pending individual arbitration claims | claim |  |  | 50 |
Pending putative class action claims | claim |  |  | 19 |
Canada |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Pending claims | claim |  |  | 8 |
Pending national class actions | claim |  |  | 6 |
Georgia |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Pending claims | claim |  |  | 4 |
Number of claims combined into a single claim | claim |  |  | 3 |
Cybersecurity Incident |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Number of state attorneys general offices company is in cooperation with | office | 47 |  |  |
Investigation, Remediation, Legal, And Other Professional Services |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Insurance coverage | $ |  |  | $ 125,000,000 |
Insurance coverage deductible | $ |  |  | $ 7,500,000.0 |
Estimate of possible loss | $ | $ 690,000,000 |  |  |
Multi-State Investigation |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Number of state attorneys general offices company is in cooperation with | office | 46 |  |  |
Public Records Litigation |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Estimate of possible loss | $ |  |  |  | $ 18,500,000
Letter of Credit |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Outstanding guarantees | $ | $ 0 |  |  |

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