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Accumulated Other Comprehensive Earnings (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Accumulated other comprehensive earnings (loss), net of tax |  |  |  |
Balance at the beginning of the period |  |  | $ 750,622 |
Adoption of ASU 2018-02 (See Note 1) |  | $ 2,726 |  | $ 2,726
Balance at the end of the period | $ 758,329 | 746,840 | 758,329 | 746,840
Foreign Currency Derivatives | Foreign currency forward contracts |  |  |  |
Accumulated other comprehensive earnings (loss), net of tax |  |  |  |
Balance at the beginning of the period | (13) |  | (309) | 51
Other comprehensive earnings (loss) before reclassifications | (105) | 134 | 191 | 125
Reclassifications from accumulated other comprehensive loss | 25 |  | 25 | (51)
Other comprehensive earnings (loss) net of tax | (80) | 134 | 216 | 74
Adoption of ASU 2018-02 (See Note 1) |  | 9 |  | 9
Balance at the end of the period | (93) | 134 | (93) | 134
Foreign Currency Derivatives | Commodity futures contracts |  |  |  |
Accumulated other comprehensive earnings (loss), net of tax |  |  |  |
Balance at the beginning of the period | (84) | (685) | (444) | 20
Other comprehensive earnings (loss) before reclassifications | (268) | (568) | (104) | (1,961)
Reclassifications from accumulated other comprehensive loss | 270 | 602 | 466 | 1,286
Other comprehensive earnings (loss) net of tax | 2 | 34 | 362 | (675)
Adoption of ASU 2018-02 (See Note 1) |  | 4 |  | 4
Balance at the end of the period | (82) | (651) | (82) | (651)
Investments |  |  |  |
Accumulated other comprehensive earnings (loss), net of tax |  |  |  |
Balance at the beginning of the period | 494 | (2,027) | (1,516) | (889)
Other comprehensive earnings (loss) before reclassifications | 278 | 158 | 2,288 | (812)
Reclassifications from accumulated other comprehensive loss | 26 |  | 26 |
Other comprehensive earnings (loss) net of tax | 304 | 158 | 2,314 | (812)
Adoption of ASU 2018-02 (See Note 1) |  | (168) |  | (168)
Balance at the end of the period | 798 | (1,869) | 798 | (1,869)
Postretirement and Pension Benefits |  |  |  |
Accumulated other comprehensive earnings (loss), net of tax |  |  |  |
Balance at the beginning of the period | 3,629 | 3,535 | 4,206 | 3,289
Reclassifications from accumulated other comprehensive loss | (288) | (250) | (865) | (752)
Other comprehensive earnings (loss) net of tax | (288) | (250) | (865) | (752)
Adoption of ASU 2018-02 (See Note 1) |  | 748 |  | 748
Balance at the end of the period | 3,341 | 3,285 | 3,341 | 3,285
Foreign Currency Translation |  |  |  |
Accumulated other comprehensive earnings (loss), net of tax |  |  |  |
Balance at the beginning of the period | (23,563) | (24,324) | (24,159) | (24,262)
Other comprehensive earnings (loss) before reclassifications | (353) | 1,164 | 243 | 1,102
Other comprehensive earnings (loss) net of tax | (353) | 1,164 | 243 | 1,102
Balance at the end of the period | (23,916) | (23,160) | (23,916) | (23,160)
Accumulated Other Comprehensive Earnings ( Loss ) |  |  |  |
Accumulated other comprehensive earnings (loss), net of tax |  |  |  |
Balance at the beginning of the period | (19,537) | (23,501) | (22,222) | (21,791)
Other comprehensive earnings (loss) before reclassifications | (448) | 888 | 2,618 | (1,546)
Reclassifications from accumulated other comprehensive loss | 33 | 352 | (348) | 483
Other comprehensive earnings (loss) net of tax | (415) | 1,240 | 2,270 | (1,063)
Adoption of ASU 2018-02 (See Note 1) |  | 593 |  | 593
Balance at the end of the period | $ (19,952) | $ (22,261) | $ (19,952) | $ (22,261)

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