Annual report pursuant to Section 13 and 15(d)

Benefit Plans - Accumulated Other Comprehensive Income (Details)

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Benefit Plans - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Pension Plans | United States    
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax    
Prior service credit $ 0 $ 0
Net gain (loss) 10,922 1,618
Gross amount recognized 10,922 1,618
Deferred income taxes (2,235) (400)
Net amount recognized 8,687 1,218
Defined Benefit Pension Plans | Foreign    
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax    
Prior service credit (151) (170)
Net gain (loss) (7,981) (2,133)
Gross amount recognized (8,132) (2,303)
Deferred income taxes 2,237 474
Net amount recognized (5,895) (1,829)
Supplemental Retirement Plans    
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax    
Net gain (loss) 681 1,055
Gross amount recognized 681 1,055
Deferred income taxes (428) (260)
Net amount recognized 253 795
Other Postretirement Benefits Plans    
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax    
Prior service credit 828 525
Net gain (loss) 67 500
Gross amount recognized 895 1,025
Deferred income taxes (371) (195)
Net amount recognized $ 524 $ 830