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Accumulated Other Comprehensive Earnings (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 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 726,520 $ 706,665
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 (8) 15
Reclassifications from accumulated other comprehensive loss (36) 16
Other comprehensive earnings (loss) net of tax (44) 31
Balance at the end of the period 16 (45)
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 (1,107) (366)
Reclassifications from accumulated other comprehensive loss 253 (732)
Other comprehensive earnings (loss) net of tax (854) (1,098)
Balance at the end of the period (830) 16
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 (948) 148
Other comprehensive earnings (loss) net of tax (948) 148
Balance at the end of the period (2,005) (549)
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 (251) (233)
Other comprehensive earnings (loss) net of tax (251) (229)
Balance at the end of the period 3,786 4,644
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 1,612 2,100
Other comprehensive earnings (loss) net of tax 1,612 2,100
Balance at the end of the period (22,650) (23,360)
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 (451) 1,901
Reclassifications from accumulated other comprehensive loss (34) (949)
Other comprehensive earnings (loss) net of tax (485) 952
Balance at the end of the period (21,683) $ (19,294)
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