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Loss Contingencies (Narratives) (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Aug. 02, 2012
USD ($)
Aug. 02, 2012
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2020
EUR (€)
Loss Contingencies [Line Items]                
Loss Contingency Accrual     $ 11,781,000   $ 11,781,000      
Estimation of asbestos-related aggregate liability that is probable and estimable     4,864,000   4,864,000      
Insurance Recoveries     77,000 $ 300,000 366,000 $ 430,000    
Estimation of product-related aggregate liability     6,033,000   6,033,000      
Loss Contingency Alleged Taxes Owed $ 7,500,000 € 6,700,000            
Loss Contingency Alleged Taxes Owed Including Penalties And Interest $ 3,100,000 € 2,800,000            
Accrual for Environmental Loss Contingencies     1,184,000   1,184,000      
Estimated Litigation Liability     75,000   75,000      
Minimum [Member]                
Loss Contingencies [Line Items]                
Product Liability Contingency, Third Party Recovery         2,000,000      
Estimation of asbestos-related aggregate liability that is probable and estimable     3,600,000   3,600,000      
Maximum [Member]                
Loss Contingencies [Line Items]                
Product Liability Contingency, Third Party Recovery         6,000,000      
Estimation of asbestos-related aggregate liability that is probable and estimable     6,500,000   6,500,000      
Magnetek [Member]                
Loss Contingencies [Line Items]                
Estimation of asbestos-related aggregate liability that is probable and estimable     767,000   767,000      
Accrual for Environmental Loss Contingencies     532,000   532,000      
Fiscal year 2004 [Member] | Minimum [Member]                
Loss Contingencies [Line Items]                
Product Liability Contingency, Third Party Recovery         3,000,000      
Fiscal year 2003 [Member] | Minimum [Member]                
Loss Contingencies [Line Items]                
Product Liability Contingency, Third Party Recovery         2,000,000      
Other Noncurrent Liabilities [Member]                
Loss Contingencies [Line Items]                
Loss Contingency Accrual     8,243,000   8,243,000      
Accrued Liabilities                
Loss Contingencies [Line Items]                
Loss Contingency Accrual, Product Liability, Gross     3,538,000   3,538,000      
Forecast [Member]                
Loss Contingencies [Line Items]                
Asbestos liability payments             $ 2,000,000  
Loss settlement gross period             12 months 12 months
Loss Contingency Alleged Taxes Owed             $ 2,100,000 € 1,900,000
Loss Contingency Alleged Taxes Owed Including Penalties And Interest             $ 2,900,000 € 2,600,000
Forecast [Member] | Minimum [Member]                
Loss Contingencies [Line Items]                
Loss contingency period             37 years 37 years
DEP [Member] | Magnetek [Member]                
Loss Contingencies [Line Items]                
Accrual for Environmental Loss Contingencies     $ 409,000   $ 409,000