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COMPONENTS OF THE COMPANY'S CONSOLIDATED BALANCE SHEETS (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract] |
Schedule of Accounts Receivable [Table Text Block] | Accounts Receivable
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31,
(In thousands) | ​ | 2020 | ​ | 2019
Accounts receivable trade | ​ | $ | 66,703 | ​ | $ | 61,036
Accrued ship and debit | ​ |  | (26,435) | ​ |  | (33,475)
Allowance for stock rotation and rebate | ​ |  | (3,931) | ​ |  | (2,524)
Allowance for credit losses | ​ | ​ | (427) | ​ | ​ | (763)
Total | ​ | $ | 35,910 | ​ | $ | 24,274
Accounts Receivable, Allowance for Credit Loss [Table Text Block] | ​
​ | ​ | ​ | ​
​ | ​ | Allowance for Credit Losses
​ | ​ | Year Ended
(In thousands) |  | December 31, 2020
Beginning balance | ​ | $ | (763)
Provision for credit loss expense | ​ |  | (621)
Receivables written off | ​ |  | 198
Recoveries collected | ​ |  | 759
Ending balance | ​ | $ | (427)
Schedule of Inventory, Current [Table Text Block] | Inventories
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31,
(In thousands) | ​ | 2020 | ​ | 2019
Raw materials | ​ | $ | 32,131 | ​ | $ | 39,058
Work-in-process | ​ |  | 39,469 | ​ |  | 25,982
Finished goods | ​ |  | 31,278 | ​ |  | 25,340
Total | ​ | $ | 102,878 | ​ | $ | 90,380
Property and Equipment [Table Text Block] | Property and Equipment
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31,
(In thousands) | ​ | 2020 | ​ | 2019
Land | ​ | $ | 22,189 | ​ | $ | 21,790
Construction-in-progress | ​ |  | 34,886 | ​ |  | 18,604
Building and improvements | ​ |  | 64,808 | ​ |  | 55,785
Machinery and equipment | ​ |  | 202,698 | ​ |  | 168,576
Computer software and hardware and office furniture and fixtures | ​ |  | 55,591 | ​ |  | 52,265
​ | ​ |  | 380,172 | ​ |  | 317,020
Accumulated depreciation | ​ |  | (213,984) | ​ |  | (200,401)
Total | ​ | $ | 166,188 | ​ | $ | 116,619
Property and Equipment Useful Lives [Table Text Block] | ​
​ | ​ | ​ | ​
Building and improvements |  | 4 - 40 | years
Machinery and equipment |  | 2 - 8 | years
Computer software and hardware and office furniture and fixtures |  | 4 - 7 | years
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Changes in accumulated other comprehensive loss for the three years ended December 31, 2020:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Unrealized Gains |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
​ | ​ | and Losses on | ​ | ​ | ​ | ​ | Foreign | ​ | ​ | ​
​ | ​ | Available-for-Sale | ​ | Defined Benefit | ​ | Currency | ​ | ​ | ​
(In thousands) | ​ | Securities | ​ | Pension Items | ​ | Items | ​ | Total
Balance at January 1, 2018 | ​ | $ | (427) | ​ | $ | (1,237) | ​ | $ | (475) | ​ | $ | (2,139)
Other comprehensive income (loss) before reclassifications | ​ |  | 161 | ​ |  | 401 | ​ |  | (236) | ​ |  | 326
Amounts reclassified from accumulated other comprehensive loss | ​ |  | — | ​ |  | 124 | (1) |  | — | ​ |  | 124
Other comprehensive income | ​ |  | 161 | ​ |  | 525 | ​ |  | (236) | ​ |  | 450
Balance at December 31, 2018 | ​ |  | (266) | ​ |  | (712) | ​ |  | (711) | ​ |  | (1,689)
Other comprehensive income (loss) before reclassifications | ​ |  | 849 | ​ |  | (1,839) | ​ |  | (518) | ​ |  | (1,508)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | — | ​ |  | 67 | (1) |  | — | ​ |  | 67
Other comprehensive loss | ​ |  | 849 | ​ |  | (1,772) | ​ |  | (518) | ​ |  | (1,441)
Balance at December 31, 2019 | ​ |  | 583 | ​ |  | (2,484) | ​ |  | (1,229) | ​ |  | (3,130)
Other comprehensive income (loss) before reclassifications | ​ |  | 307 | ​ |  | 636 | ​ |  | (183) | ​ |  | 760
Amounts reclassified from accumulated other comprehensive loss | ​ |  | — | ​ |  | 207 | (1) |  | — | ​ |  | 207
Other comprehensive income | ​ |  | 307 | ​ |  | 843 | ​ |  | (183) | ​ |  | 967
Balance at December 31, 2020 | ​ | $ | 890 | ​ | $ | (1,641) | ​ | $ | (1,412) | ​ | $ | (2,163)
(1) | This component of accumulated other comprehensive loss is included in the computation of net periodic pension cost for the years ended December 31, 2020, 2019 and 2018.

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