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Components of Accumulated Other Comprehensive Loss - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Product revenues | $ 544,301 |  |  | $ 509,398 |  |  | $ 1,642,976 | $ 1,355,520
Interest expense | 16,004 |  |  | 15,794 |  |  | 48,854 | 43,396
Income from continuing operations before income taxes | 18,242 |  |  | (8,267) |  |  | 50,277 | (28,719)
Income tax expense (benefit) | 6,989 |  |  | (1,654) |  |  | 19,782 | (4,640)
Net income (loss) | 9,828 | $ 15,080 | $ 1,565 | (8,339) | $ (9,455) | $ 1,227 | 26,473 | (16,567)
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 | 6,047 |  |  | 5,075 |  |  | 18,258 | 20,488
Income tax expense (benefit) | (358) |  |  | (323) |  |  | (1,074) | (2,356)
Net income (loss) | 5,689 |  |  | 4,752 |  |  | 17,184 | 18,132
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 | 454 |  |  | 1,225 |  |  | 2,134 | 1,199
Income tax expense (benefit) | (148) |  |  | (408) |  |  | (646) | (595)
Net income (loss) | 306 |  |  | 817 |  |  | 1,488 | 604
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 | (418) |  |  | 174 |  |  | (465) | (1,562)
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 |  |  | 312 |  |  | 0 | 912
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 | 872 |  |  | 739 |  |  | 2,599 | 1,849
Amount Reclassified from Accumulated Other Comprehensive Loss | Actuarial losses |  |  |  |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Defined benefit pension income | 5,922 |  |  | 4,962 |  |  | 17,877 | 14,799
Amount Reclassified from Accumulated Other Comprehensive Loss | Prior service costs |  |  |  |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Defined benefit pension income | 125 |  |  | 113 |  |  | 381 | 326
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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