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Accumulated Other Comprehensive Earnings (Loss) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 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 726,110 $ 703,433
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 (9) 95
Reclassifications from accumulated other comprehensive loss (51) 34
Other comprehensive earnings (loss) net of tax (60) 129
Balance at the end of the period   53
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 (1,393) (1,213)
Reclassifications from accumulated other comprehensive loss 684 (122)
Other comprehensive earnings (loss) net of tax (709) (1,335)
Balance at the end of the period (685) (221)
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 (970) 242
Other comprehensive earnings (loss) net of tax (970) 242
Balance at the end of the period (2,027) (455)
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   4
Reclassifications from accumulated other comprehensive loss (502) (466)
Other comprehensive earnings (loss) net of tax (502) (462)
Balance at the end of the period 3,535 4,411
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 (62) 3,091
Other comprehensive earnings (loss) net of tax (62) 3,091
Balance at the end of the period (24,324) (22,369)
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 (2,434) 2,219
Reclassifications from accumulated other comprehensive loss 131 (554)
Other comprehensive earnings (loss) net of tax (2,303) 1,665
Balance at the end of the period (23,501) $ (18,581)
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