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Components of Accumulated Other Comprehensive Loss - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Product revenues | $ 569,820 |  | $ 447,281 |  | $ 1,098,675 | $ 846,122
Interest expense | 15,986 |  | 14,953 |  | 32,850 | 27,602
Income from continuing operations before income taxes | 24,795 |  | (11,978) |  | 32,035 | (20,452)
Income tax expense (benefit) | 8,564 |  | (2,304) |  | 12,793 | (2,986)
Net income (loss) | 15,080 | $ 1,565 | (9,455) | $ 1,227 | 16,645 | (8,228)
Amount Reclassified from Accumulated Other Comprehensive Loss | Cumulative Unrecognized Actuarial Losses on Pension Obligations |  |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Income from continuing operations before income taxes | 6,136 |  | 4,863 |  | 12,211 | 15,413
Income tax expense (benefit) | (358) |  | (323) |  | (716) | (2,033)
Net income (loss) | 5,778 |  | 4,540 |  | 11,495 | 13,380
Amount Reclassified from Accumulated Other Comprehensive Loss | Effective Portion of Deriviatives Designated as Hedging Instruments |  |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Income from continuing operations before income taxes | 865 |  | 695 |  | 1,680 | (26)
Income tax expense (benefit) | (253) |  | (263) |  | (498) | (187)
Net income (loss) | 612 |  | 432 |  | 1,182 | (213)
Amount Reclassified from Accumulated Other Comprehensive Loss | Effective Portion of Deriviatives Designated as Hedging Instruments | Foreign currency exchange forward contracts |  |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Discontinued Operation, Gain From Disposal Of Discontinued Operation, Before Income Tax | 0 |  | 0 |  | 0 | 12,906
Product revenues | 3 |  | (332) |  | (47) | (1,736)
Amount Reclassified from Accumulated Other Comprehensive Loss | Effective Portion of Deriviatives Designated as Hedging Instruments | Cross currency interest rate swaps |  |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Interest expense | 0 |  | 295 |  | 0 | 600
Amount Reclassified from Accumulated Other Comprehensive Loss | Effective Portion of Deriviatives Designated as Hedging Instruments | Interest rate swaps |  |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Interest expense | 862 |  | 732 |  | 1,727 | 1,110
Amount Reclassified from Accumulated Other Comprehensive Loss | Actuarial losses |  |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Defined benefit pension income | 6,007 |  | 4,757 |  | 11,955 | 9,837
Amount Reclassified from Accumulated Other Comprehensive Loss | Prior service costs |  |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Defined benefit pension income | 129 |  | 106 |  | 256 | 213
Amount Reclassified from Accumulated Other Comprehensive Loss | Pension liability transfer - discontinued business |  |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Defined benefit pension income | $ 0 |  | $ 0 |  | $ 0 | $ 5,363

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