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Restructuring and Impairment Charges (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]    
Other income (expense) $ 1,848,000 $ 539,000
Restructuring and impairment charges   1,792,000
Asset impairment charge   333,000
2017 Cost Reduction Program [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges   1,879,000
Restructuring and impairment charges $ 0  
Asset impairment charge   333,000
2017 Cost Reduction Program [Member] | Accounting Standards Update 2017-07 [Member]    
Restructuring Cost and Reserve [Line Items]    
Other income (expense)   $ 420,000