Annual report pursuant to Section 13 and 15(d)

Accumulated Other Comprehensive Income (Loss) - Pre-tax and After-tax Components of Other Comprehensive Income (Loss) (Details)

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Accumulated Other Comprehensive Income (Loss) - Pre-tax and After-tax Components of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
After-tax amount      
Pre-tax amount $ 19,800 $ (50,217) $ 60,500
Tax benefit / (expense) 2,854 6,873 (3,590)
Total other comprehensive income (loss) 22,654 (43,344) 56,910
Amortization of net gains and (losses)      
After-tax amount      
Pre-tax amount 2,970 (10,279) (61)
Tax benefit / (expense) (423) 2,380 19
Total other comprehensive income (loss) 2,547 (7,899) (42)
Amortization of prior service cost      
After-tax amount      
Pre-tax amount (156) (78) (78)
Tax benefit / (expense) 39 19 19
Total other comprehensive income (loss) (117) (59) (59)
Benefit plans, net      
After-tax amount      
Pre-tax amount 2,814 (10,357) (139)
Tax benefit / (expense) (384) 2,399 38
Total other comprehensive income (loss) 2,430 (7,958) (101)
Net loss (gain) from hedging activities      
After-tax amount      
Pre-tax amount (3,553) (441) (5,799)
Tax benefit / (expense) 888 110 2,209
Total other comprehensive income (loss) (2,665) (331) (3,590)
Foreign currency translation      
After-tax amount      
Pre-tax amount 20,539 (39,419) 66,438
Tax benefit / (expense) 2,350 4,364 (5,837)
Total other comprehensive income (loss) $ 22,889 $ (35,055) $ 60,601