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Accumulated Other Comprehensive Earnings (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 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 $ 742,804 726,110 742,804 726,110
Foreign Currency Derivatives | Foreign currency forward contracts        
Accumulated other comprehensive earnings (loss), net of tax        
Balance at the beginning of the period (150) 16 (309) 51
Other comprehensive earnings (loss) before reclassifications 137 (1) 296 (9)
Reclassifications from accumulated other comprehensive loss   (15)   (51)
Other comprehensive earnings (loss) net of tax 137 (16) 296 (60)
Adoption of ASU 2018-02 (See Note 1)   9   9
Balance at the end of the period (13)   (13)  
Foreign Currency Derivatives | Commodity futures contracts        
Accumulated other comprehensive earnings (loss), net of tax        
Balance at the beginning of the period (114) (830) (444) 20
Other comprehensive earnings (loss) before reclassifications (94) (286) 164 (1,393)
Reclassifications from accumulated other comprehensive loss 124 431 196 684
Other comprehensive earnings (loss) net of tax 30 145 360 (709)
Adoption of ASU 2018-02 (See Note 1)   4   4
Balance at the end of the period (84) (685) (84) (685)
Investments        
Accumulated other comprehensive earnings (loss), net of tax        
Balance at the beginning of the period (404) (2,005) (1,516) (889)
Other comprehensive earnings (loss) before reclassifications 898 (22) 2,010 (970)
Other comprehensive earnings (loss) net of tax 898 (22) 2,010 (970)
Adoption of ASU 2018-02 (See Note 1)   (168)   (168)
Balance at the end of the period 494 (2,027) 494 (2,027)
Postretirement and Pension Benefits        
Accumulated other comprehensive earnings (loss), net of tax        
Balance at the beginning of the period 3,918 3,786 4,206 3,289
Reclassifications from accumulated other comprehensive loss (289) (251) (577) (502)
Other comprehensive earnings (loss) net of tax (289) (251) (577) (502)
Adoption of ASU 2018-02 (See Note 1)   748   748
Balance at the end of the period 3,629 3,535 3,629 3,535
Foreign Currency Translation        
Accumulated other comprehensive earnings (loss), net of tax        
Balance at the beginning of the period (23,768) (22,650) (24,159) (24,262)
Other comprehensive earnings (loss) before reclassifications 205 (1,674) 596 (62)
Other comprehensive earnings (loss) net of tax 205 (1,674) 596 (62)
Balance at the end of the period (23,563) (24,324) (23,563) (24,324)
Accumulated Other Comprehensive Earnings ( Loss )        
Accumulated other comprehensive earnings (loss), net of tax        
Balance at the beginning of the period (20,518) (21,683) (22,222) (21,791)
Other comprehensive earnings (loss) before reclassifications 1,146 (1,983) 3,066 (2,434)
Reclassifications from accumulated other comprehensive loss (165) 165 (381) 131
Other comprehensive earnings (loss) net of tax 981 (1,818) 2,685 (2,303)
Adoption of ASU 2018-02 (See Note 1)   593   593
Balance at the end of the period $ (19,537) $ (23,501) $ (19,537) $ (23,501)