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SIGNIFICANT ACCOUNTING POLICIES - Property (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Property, plant and equipment: |  |  |  |  |
Depreciation expense |  |  | $ 18,669 | $ 18,991 | $ 19,627
Carrying value of long-lived assets: |  |  |  |  |
Impairment charges of long-lived assets |  |  | $ 1,126 | $ 2,371 |
Buildings | Minimum |  |  |  |  |
Property, plant and equipment: |  |  |  |  |
Useful lives |  |  | 20 years |  |
Buildings | Maximum |  |  |  |  |
Property, plant and equipment: |  |  |  |  |
Useful lives |  |  | 35 years |  |
Machinery and equipment | Minimum |  |  |  |  |
Property, plant and equipment: |  |  |  |  |
Useful lives |  |  | 5 years |  |
Machinery and equipment | Maximum |  |  |  |  |
Property, plant and equipment: |  |  |  |  |
Useful lives |  |  | 20 years |  |
Selling, Marketing, and Administrative Expense |  |  |  |  |
Carrying value of long-lived assets: |  |  |  |  |
Impairment charges of long-lived assets | $ 1,126 | $ 2,371 |  |  |

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