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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)