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Accumulated Other Comprehensive Income (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 2,000   $ 2,000   $ 1,370,000  
Unrealized Foreign Currency Hedge Gain (Loss), Tax (174,000) $ (68,000) 186,000 $ (202,000)    
Derivative [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax (1,434,000) (578,000) (1,434,000) (578,000) (191,000) $ (612,000)
Unrealized Loss on Foreign Currency Derivatives, before Tax     (1,060,000) 119,000    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net     (533,000) (47,000)    
Other Comprehensive Income (Loss), Tax     350,000 (38,000)    
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax 1,436,000 2,579,000 1,436,000 2,579,000 1,561,000 2,729,000
Unrealized Loss on Foreign Currency Derivatives, before Tax     0 0    
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Before Tax     158,000 190,000    
Other Comprehensive Income (Loss), Tax     33,000 40,000    
Accumulated Other Comprehensive Income            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 2,000 $ 2,001,000 2,000 2,001,000 $ 1,370,000 $ 2,117,000
Unrealized Loss on Foreign Currency Derivatives, before Tax     (1,060,000) 119,000    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     (691,000) (237,000)    
Other Comprehensive Income (Loss), Tax     $ 383,000 $ 2,000