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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Summary of Significant Accounting Policies |
Schedule of Accounts Receivable and Concentration of Credit Risk | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31 |  | 2020 |  | 2019 |  | 2018
Ford Motor Company | ​ | 11 | % | ​ | 11 | % | ​ | 12 | %
Volvo | ​ | 8 | % | ​ | 8 | % | ​ | 8 | %
Schedule of Inventory, Current | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
December 31 |  | 2020 |  | 2019
Raw materials | ​ | $ | 67,775 | ​ | $ | 66,357
Work-in-progress | ​ | ​ | 7,005 | ​ | ​ | 5,582
Finished goods | ​ | ​ | 15,768 | ​ | ​ | 21,510
Total inventories, net | ​ | $ | 90,548 | ​ | $ | 93,449
Property, Plant and Equipment | ​
Property, plant and equipment are recorded at cost and consist of the following: ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31 |  | 2020 |  | 2019
Land and land improvements | ​ | $ | 4,447 | ​ | $ | 4,550
Buildings and improvements | ​ | ​ | 39,784 | ​ | ​ | 39,263
Machinery and equipment | ​ | ​ | 253,563 | ​ | ​ | 226,076
Office furniture and fixtures | ​ | ​ | 9,993 | ​ | ​ | 9,708
Tooling | ​ | ​ | 40,967 | ​ | ​ | 76,933
Information technology | ​ | ​ | 28,491 | ​ | ​ | 32,410
Vehicles | ​ | ​ | 654 | ​ | ​ | 614
Leasehold improvements | ​ | ​ | 5,198 | ​ | ​ | 4,588
Construction in progress | ​ | ​ | 19,744 | ​ | ​ | 17,312
Total property, plant, and equipment | ​ | ​ | 402,841 | ​ | ​ | 411,454
Less: accumulated depreciation | ​ | ​ | (283,517) | ​ | ​ | (288,971)
Property, plant and equipment, net | ​ | $ | 119,324 | ​ | $ | 122,483
Schedule of Property, Plant and Equipment Estimated Useful Lives | ​
​ | ​ | ​ | ​
Buildings and improvements |  | ​ | 10-40 years
Machinery and equipment | ​ | ​ | 3-10 years
Office furniture and fixtures | ​ | ​ | 3-10 years
Tooling | ​ | ​ | 2-7 years
Information technology | ​ | ​ | 3-7 years
Vehicles | ​ | ​ | 3-7 years
Leasehold improvements | ​ | ​ | shorter of lease term or 3-10 years
Schedule of Goodwill | ​
​ | ​ | ​ | ​
​ |  | ​
Balance at January 1, 2020 | ​ | $ | 35,874
Currency translation | ​ | ​ | 3,230
Balance at December 31, 2020 | ​ | $ | 39,104
​
​ | ​ | ​ | ​
Balance at January 1, 2019 | ​ | $ | 36,717
Currency translation | ​ | ​ | (843)
Balance at December 31, 2019 | ​ | $ | 35,874
Schedule of Acquired Finite-Lived Intangible Assets by Major Class | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Acquisition | ​ | Accumulated | ​ | ​ | ​
As of December 31, 2020 |  | cost |  | amortization |  | Net
Customer lists | ​ | $ | 48,339 | ​ | $ | (18,530) | ​ | $ | 29,809
Tradenames | ​ | ​ | 17,201 | ​ | ​ | (6,290) | ​ | ​ | 10,911
Technology | ​ | ​ | 13,799 | ​ | ​ | (8,079) | ​ | ​ | 5,720
Capitalized software development | ​ | ​ | 8,954 | ​ | ​ | - | ​ | ​ | 8,954
Total | ​ | $ | 88,293 | ​ | $ | (32,899) | ​ | $ | 55,394
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Acquisition | ​ | Accumulated | ​ | ​ | ​
As of December 31, 2019 |  | cost |  | amortization |  | Net
Customer lists | ​ | $ | 50,750 | ​ | $ | (17,466) | ​ | $ | 33,284
Tradenames | ​ | ​ | 20,041 | ​ | ​ | (6,687) | ​ | ​ | 13,354
Technology | ​ | ​ | 15,231 | ​ | ​ | (7,353) | ​ | ​ | 7,878
Capitalized software development | ​ | ​ | 3,606 | ​ | ​ | - | ​ | ​ | 3,606
Total | ​ | $ | 89,628 | ​ | $ | (31,506) | ​ | $ | 58,122
Accrued Expenses and Other Current Liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
As of December 31 |  | 2020 |  | 2019
Compensation related liabilities | ​ | $ | 21,852 | ​ | $ | 19,566
Product warranty and recall obligations | ​ | ​ | 9,044 | ​ | ​ | 7,685
Other (A) | ​ | ​ | 21,376 | ​ | ​ | 27,972
Total accrued expenses and other current liabilities | ​ | $ | 52,272 | ​ | $ | 55,223
(A) | “Other” is comprised of miscellaneous accruals, none of which individually contributed a significant portion of the total.
Schedule of Product Warranty and Recall Liability | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31 |  | 2020 |  | 2019
Product warranty and recall at beginning of period | ​ | $ | 10,796 | ​ | $ | 10,494
Accruals for warranties established during period | ​ | ​ | 5,898 | ​ | ​ | 7,131
Aggregate changes in pre-existing liabilities due to claim developments | ​ | ​ | 1,794 | ​ | ​ | 1,037
Settlements made during the period | ​ | ​ | (6,297) | ​ | ​ | (7,600)
Foreign currency translation | ​ | ​ | 500 | ​ | ​ | (266)
Product warranty and recall at end of period | ​ | $ | 12,691 | ​ | $ | 10,796
Schedule of Weighted-Average Number of Shares | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 |  | 2019 |  | 2018
Basic weighted-average Common Shares outstanding | ​ | 27,024,571 | ​ | 27,791,799 | ​ | 28,402,227
Effect of dilutive shares | ​ | - | ​ | 478,296 | ​ | 677,599
Diluted weighted-average Common Shares outstanding | ​ | 27,024,571 | ​ | 28,270,095 | ​ | 29,079,826
Schedule of Changes in Accumulated Other Comprehensive Loss by Component | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Foreign | ​ | Unrealized | ​ | ​ | ​
​ | ​ | currency | ​ | gain (loss) | ​ | ​ | ​
​ |  | translation |  | on derivatives |  | Total
Balance at January 1, 2020 | ​ | $ | (91,472) | ​ | $ | - | ​ | $ | (91,472)
Other comprehensive income (loss) before reclassifications | ​ | ​ | 2,677 | ​ | ​ | (2,366) | ​ | ​ | 311
Amounts reclassified from accumulated other comprehensive loss | ​ | ​ | - | ​ | ​ | 1,526 | ​ | ​ | 1,526
Net other comprehensive income (loss), net of tax | ​ | ​ | 2,677 | ​ | ​ | (840) | ​ | ​ | 1,837
Balance at December 31, 2020 | ​ | $ | (88,795) | ​ | $ | (840) | ​ | $ | (89,635)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at January 1, 2019 | ​ | $ | (86,044) | ​ | $ | 292 | ​ | $ | (85,752)
Other comprehensive (loss) income before reclassifications | ​ | ​ | (5,428) | ​ | ​ | 355 | ​ | ​ | (5,073)
Amounts reclassified from accumulated other comprehensive loss | ​ | ​ | - | ​ | ​ | (647) | ​ | ​ | (647)
Net other comprehensive loss, net of tax | ​ | ​ | (5,428) | ​ | ​ | (292) | ​ | ​ | (5,720)
Balance at December 31, 2019 | ​ | $ | (91,472) | ​ | $ | - | ​ | $ | (91,472)

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