Accumulated Other Comprehensive Earnings (Loss) (Details) - USD ($) $ in Thousands | 9 Months Ended |
Sep. 30, 2018 | Sep. 30, 2017 |
Accumulated other comprehensive earnings (loss), net of tax | | |
Balance at the beginning of the period | $ 733,840 | |
Adoption of ASU 2018-02 (See Note 1) | 2,726 | |
Balance at the end of the period | 746,840 | $ 714,481 |
Foreign Currency Derivatives | Foreign currency forward contracts | | |
Accumulated other comprehensive earnings (loss), net of tax | | |
Balance at the beginning of the period | 51 | (76) |
Other comprehensive earnings (loss) before reclassifications | 125 | 170 |
Reclassifications from accumulated other comprehensive loss | (51) | |
Other comprehensive earnings (loss) net of tax | 74 | 170 |
Balance at the end of the period | 134 | 94 |
Foreign Currency Derivatives | Foreign currency forward contracts | New Accounting Pronouncement, Early Adoption, Effect | ASU 2018-02 | | |
Accumulated other comprehensive earnings (loss), net of tax | | |
Adoption of ASU 2018-02 (See Note 1) | 9 | |
Foreign Currency Derivatives | Commodity futures contracts | | |
Accumulated other comprehensive earnings (loss), net of tax | | |
Balance at the beginning of the period | 20 | 1,114 |
Other comprehensive earnings (loss) before reclassifications | (1,961) | (1,276) |
Reclassifications from accumulated other comprehensive loss | 1,286 | (69) |
Other comprehensive earnings (loss) net of tax | (675) | (1,345) |
Balance at the end of the period | (651) | (231) |
Foreign Currency Derivatives | Commodity futures contracts | New Accounting Pronouncement, Early Adoption, Effect | ASU 2018-02 | | |
Accumulated other comprehensive earnings (loss), net of tax | | |
Adoption of ASU 2018-02 (See Note 1) | 4 | |
Investments | | |
Accumulated other comprehensive earnings (loss), net of tax | | |
Balance at the beginning of the period | (889) | (697) |
Other comprehensive earnings (loss) before reclassifications | (812) | 319 |
Other comprehensive earnings (loss) net of tax | (812) | 319 |
Balance at the end of the period | (1,869) | (378) |
Investments | New Accounting Pronouncement, Early Adoption, Effect | ASU 2018-02 | | |
Accumulated other comprehensive earnings (loss), net of tax | | |
Adoption of ASU 2018-02 (See Note 1) | (168) | |
Postretirement and Pension Benefits | | |
Accumulated other comprehensive earnings (loss), net of tax | | |
Balance at the beginning of the period | 3,289 | 4,873 |
Other comprehensive earnings (loss) before reclassifications | | 6 |
Reclassifications from accumulated other comprehensive loss | (752) | (700) |
Other comprehensive earnings (loss) net of tax | (752) | (694) |
Balance at the end of the period | 3,285 | 4,179 |
Postretirement and Pension Benefits | New Accounting Pronouncement, Early Adoption, Effect | ASU 2018-02 | | |
Accumulated other comprehensive earnings (loss), net of tax | | |
Adoption of ASU 2018-02 (See Note 1) | 748 | |
Foreign Currency Translation Adjustment | | |
Accumulated other comprehensive earnings (loss), net of tax | | |
Balance at the beginning of the period | (24,262) | (25,460) |
Other comprehensive earnings (loss) before reclassifications | 1,102 | 2,875 |
Other comprehensive earnings (loss) net of tax | 1,102 | 2,875 |
Balance at the end of the period | (23,160) | (22,585) |
Accumulated Other Comprehensive Earnings ( Loss ) | | |
Accumulated other comprehensive earnings (loss), net of tax | | |
Balance at the beginning of the period | (21,791) | (20,246) |
Other comprehensive earnings (loss) before reclassifications | (1,546) | 2,094 |
Reclassifications from accumulated other comprehensive loss | 483 | (769) |
Other comprehensive earnings (loss) net of tax | (1,063) | 1,325 |
Balance at the end of the period | (22,261) | $ (18,921) |
Accumulated Other Comprehensive Earnings ( Loss ) | New Accounting Pronouncement, Early Adoption, Effect | ASU 2018-02 | | |
Accumulated other comprehensive earnings (loss), net of tax | | |
Adoption of ASU 2018-02 (See Note 1) | $ 593 | |