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Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  | $ 1,172,466 |  |  |
Other comprehensive income (loss) before reclassifications |  |  | (3,860) | $ (80,398) |  |
Amounts reclassified from accumulated other comprehensive loss |  |  | 280 | 260 |  |
Other comprehensive income (loss) | $ (17,813) | $ (34,948) | (3,580) | (80,138) |  |
Balance, end of period | 1,210,612 | 1,089,853 | 1,210,612 | 1,089,853 |  |
AOCI, Pension and other postretirement benefit plans, tax | 1,846 | 2,056 | 1,846 | 2,056 | $ 1,926 | $ 2,125
Accumulated Other Comprehensive Loss |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | (71,031) | (90,433) | (85,264) | (45,243) |  |
Other comprehensive income (loss) | (17,813) | (34,948) | (3,580) | (80,138) |  |
Balance, end of period | (88,844) | (125,381) | (88,844) | (125,381) |  |
Foreign Currency Translation Adjustments |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  | (75,575) | (35,641) |  |
Other comprehensive income (loss) before reclassifications |  |  | (3,860) | (80,383) |  |
Amounts reclassified from accumulated other comprehensive loss |  |  | 0 | 0 |  |
Other comprehensive income (loss) |  |  | (3,860) | (80,383) |  |
Balance, end of period | (79,435) | (116,024) | (79,435) | (116,024) |  |
Pension and Other Postretirement Benefits |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  | (9,689) | (9,602) |  |
Other comprehensive income (loss) before reclassifications |  |  | 0 | (15) |  |
Amounts reclassified from accumulated other comprehensive loss |  |  | 280 | 260 |  |
Other comprehensive income (loss) |  |  | 280 | 245 |  |
Balance, end of period | $ (9,409) | $ (9,357) | $ (9,409) | $ (9,357) |  |

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