| **Property, Plant, and Equipment (Details) - USD ($) $ in Thousands** | 3 Months Ended | 6 Months Ended |           |
|-----------------------------------------------------------------------|----------------|----------------|-----------|
||
| **Property, Plant and Equipment [Line Items]**                        |           |           |      |   |   |
| Property, plant and equipment, gross                                  | $ 901,190      |           | $ 901,190 |   | $ 889,360 |
| Accumulated depreciation and amortization                             | (543,629)      |           | (543,629) |   | (533,795) |
| Property, plant and equipment - net                                   | 357,561        |           | 357,561   |   | 355,565 |
| Depreciation                                                          | 12,393         | $ 12,700       | 24,698    | $ 25,639 |   |
| Land                                                                  |           |           |      |   |   |
| **Property, Plant and Equipment [Line Items]**                        |           |           |      |   |   |
| Property, plant and equipment, gross                                  | 9,358          |           | 9,358     |   | 9,238 |
| Land improvements                                                     |           |           |      |   |   |
| **Property, Plant and Equipment [Line Items]**                        |           |           |      |   |   |
| Property, plant and equipment, gross                                  | 4,913          |           | 4,913     |   | 4,786 |
| Buildings                                                             |           |           |      |   |   |
| **Property, Plant and Equipment [Line Items]**                        |           |           |      |   |   |
| Property, plant and equipment, gross                                  | 274,242        |           | 274,242   |   | 263,399 |
| Machinery and equipment                                               |           |           |      |   |   |
| **Property, Plant and Equipment [Line Items]**                        |           |           |      |   |   |
| Property, plant and equipment, gross                                  | 500,427        |           | 500,427   |   | 491,180 |
| Enterprise management system                                          |           |           |      |   |   |
| **Property, Plant and Equipment [Line Items]**                        |           |           |      |   |   |
| Property, plant and equipment, gross                                  | 50,532         |           | 50,532    |   | 50,532 |
| Construction-in-progress                                              |           |           |      |   |   |
| **Property, Plant and Equipment [Line Items]**                        |           |           |      |   |   |
| Property, plant and equipment, gross                                  | 26,291         |           | 26,291    |   | 32,719 |
| Leased property under finance leases                                  |           |           |      |   |   |
| **Property, Plant and Equipment [Line Items]**                        |           |           |      |   |   |
| Property, plant and equipment, gross                                  | $ 35,427       |           | $ 35,427  |   | $ 37,506 |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of accumulated depreciation and amortization from plant, property, and equipment and right-of-use asset from finance lease.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, before accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| X                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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