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COMPREHENSIVE EARNINGS (LOSS) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Accumulated other comprehensive earnings (loss), net of tax |  |
Balance at the beginning of the period | $ 711,364 |
Balance at the end of the period | 733,840 | $ 711,364
Foreign Currency Derivatives |  |
Accumulated other comprehensive earnings (loss), net of tax |  |
Balance at the beginning of the period | (76) | (1,675)
Other comprehensive earnings (loss) before reclassifications | 152 | 325
Reclassifications from accumulated other comprehensive loss | (25) | 1,274
Other comprehensive earnings (loss) net of tax | 127 | 1,599
Balance at the end of the period | 51 | (76)
Investments |  |
Accumulated other comprehensive earnings (loss), net of tax |  |
Balance at the beginning of the period | (697) | (605)
Other comprehensive earnings (loss) before reclassifications | (192) | (95)
Reclassifications from accumulated other comprehensive loss |  | 3
Other comprehensive earnings (loss) net of tax | (192) | (92)
Balance at the end of the period | (889) | (697)
Postretirement and Pension Benefits |  |
Accumulated other comprehensive earnings (loss), net of tax |  |
Balance at the beginning of the period | 4,873 | 6,387
Other comprehensive earnings (loss) before reclassifications | (651) | (466)
Reclassifications from accumulated other comprehensive loss | (933) | (1,048)
Other comprehensive earnings (loss) net of tax | (1,584) | (1,514)
Balance at the end of the period | 3,289 | 4,873
Foreign Currency Translation Adjustment |  |
Accumulated other comprehensive earnings (loss), net of tax |  |
Balance at the beginning of the period | (25,460) | (21,644)
Other comprehensive earnings (loss) before reclassifications | 1,198 | (3,816)
Other comprehensive earnings (loss) net of tax | 1,198 | (3,816)
Balance at the end of the period | (24,262) | (25,460)
Commodity Derivatives |  |
Accumulated other comprehensive earnings (loss), net of tax |  |
Balance at the beginning of the period | 1,114 | 173
Other comprehensive earnings (loss) before reclassifications | (1,050) | 1,481
Reclassifications from accumulated other comprehensive loss | (44) | (540)
Other comprehensive earnings (loss) net of tax | (1,094) | 941
Balance at the end of the period | 20 | 1,114
Accumulated Other Comprehensive Earnings ( Loss ) |  |
Accumulated other comprehensive earnings (loss), net of tax |  |
Balance at the beginning of the period | (20,246) | (17,364)
Other comprehensive earnings (loss) before reclassifications | (543) | (2,571)
Reclassifications from accumulated other comprehensive loss | (1,002) | (311)
Other comprehensive earnings (loss) net of tax | (1,545) | (2,882)
Balance at the end of the period | $ (21,791) | $ (20,246)

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