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Stockholders' Equity - Pre-tax and After-tax Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
After-tax amount |  |  |
Pre-tax amount | $ 15,254 | $ (8,455) | $ 19,800
Tax benefit / (expense) | 4,065 | (6,960) | 2,854
Total other comprehensive income (loss) | 19,319 | (15,415) | 22,654
Amortization of net gains and (losses) |  |  |
After-tax amount |  |  |
Pre-tax amount | 5,885 | 2,760 | 2,970
Tax benefit / (expense) | (1,461) | (696) | (423)
Total other comprehensive income (loss) | 4,424 | 2,064 | 2,547
Amortization of prior service cost |  |  |
After-tax amount |  |  |
Pre-tax amount | (232) | (232) | (156)
Tax benefit / (expense) | 58 | 58 | 39
Total other comprehensive income (loss) | (174) | (174) | (117)
Settlement gain (loss) |  |  |
After-tax amount |  |  |
Pre-tax amount | 2,059 | 64 | 0
Tax benefit / (expense) | (515) | (16) | 0
Total other comprehensive income (loss) | 1,544 | 48 | 0
Benefit plans, net |  |  |
After-tax amount |  |  |
Pre-tax amount | 7,712 | 2,592 | 2,814
Tax benefit / (expense) | (1,918) | (654) | (384)
Total other comprehensive income (loss) | 5,794 | 1,938 | 2,430
Net loss (gain) from hedging activities |  |  |
After-tax amount |  |  |
Pre-tax amount | 3,885 | 221 | (3,553)
Tax benefit / (expense) | (971) | (55) | 888
Total other comprehensive income (loss) | 2,914 | 166 | (2,665)
Foreign currency translation |  |  |
After-tax amount |  |  |
Pre-tax amount | 3,657 | (11,268) | 20,539
Tax benefit / (expense) | 6,954 | (6,251) | 2,350
Total other comprehensive income (loss) | $ 10,611 | $ (17,519) | $ 22,889

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