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RATIONALIZATION CHARGES - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |
Rationalization charges | $ 16,031 | $ 56,351 | $ 6,253 |
Restructuring reserve | 41,560 | 43,713 | 1,612 | $ 2,419
Accrued Liabilities |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring reserve | 4,500 | 5,000 |  |
Other Liabilities |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring reserve | 37,000 | 38,700 |  |
Metal Container Plant Closings and the Central States Pension Plan withdrawal |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Rationalization charges | 4,100 | 46,200 |  |
Central States Pension Plan withdrawal | Annually Through 2040 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Accretion expense | 1,100 |  |  |
Effect on future cash flows, amount | 3,100 |  |  |
Central States Pension Plan withdrawal | Metal Container Plant Closings and the Central States Pension Plan withdrawal |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net rationalization charges | 62,000 |  |  |
Plant Exit Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Rationalization charges | 2,296 | 1,336 | 534 |
Restructuring reserve | 555 | $ 898 | $ 1,482 | $ 2,397
Plant Exit Costs | Metal Container Plant Closings and the Central States Pension Plan withdrawal |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net rationalization charges | 3,500 |  |  |
Other Restructuring | Rationalization Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Effect on future cash flows, amount | 3,900 |  |  |
Remaining expenses for our rationalization plans | $ 2,500 |  |  |

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