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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Summary of Significant Accounting Policies |
Schedule of Accounts Receivable and Concentration of Credit Risk | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |  | 2017
Ford Motor Company | ​ | 11 | % | ​ | 12 | % | ​ | 14 | %
Volvo | ​ | 8 | % | ​ | 8 | % | ​ | 6 | %
Schedule of Inventory, Current | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
December 31 |  | 2019 |  | 2018
Raw materials | ​ | $ | 66,357 | ​ | $ | 54,382
Work-in-progress | ​ | ​ | 5,582 | ​ | ​ | 4,710
Finished goods | ​ | ​ | 21,510 | ​ | ​ | 20,186
Total inventories, net | ​ | $ | 93,449 | ​ | $ | 79,278
Business Acquisition, Pro Forma Information | ​
​ | ​ | ​ | ​
Year ended December 31, |  | 2017
Net sales | ​ | $ | 829,474
Net income attributable to Stoneridge, Inc. and subsidiaries | ​ | $ | 45,283
Property, Plant and Equipment | ​
Property, plant and equipment are recorded at cost and consist of the following: ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31 |  | 2019 |  | 2018
Land and land improvements | ​ | $ | 4,550 | ​ | $ | 4,619
Buildings and improvements | ​ | ​ | 39,263 | ​ | ​ | 37,234
Machinery and equipment | ​ | ​ | 226,076 | ​ | ​ | 212,225
Office furniture and fixtures | ​ | ​ | 9,708 | ​ | ​ | 9,929
Tooling | ​ | ​ | 76,933 | ​ | ​ | 75,620
Information technology | ​ | ​ | 32,410 | ​ | ​ | 27,179
Vehicles | ​ | ​ | 614 | ​ | ​ | 872
Leasehold improvements | ​ | ​ | 4,588 | ​ | ​ | 2,799
Construction in progress | ​ | ​ | 17,312 | ​ | ​ | 23,064
Total property, plant, and equipment | ​ | ​ | 411,454 | ​ | ​ | 393,541
Less: accumulated depreciation | ​ | ​ | (288,971) | ​ | ​ | (281,328)
Property, plant and equipment, net | ​ | $ | 122,483 | ​ | $ | 112,213
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, 2019 | ​ | $ | 36,717
Currency translation | ​ | ​ | (843)
Balance at December 31, 2019 | ​ | $ | 35,874
​
​ | ​ | ​ | ​
Balance at January 1, 2018 | ​ | $ | 38,419
Currency translation | ​ | ​ | (1,702)
Balance at December 31, 2018 | ​ | $ | 36,717
Schedule of Acquired Finite-Lived Intangible Assets by Major Class | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Acquisition | ​ | Accumulated | ​ | ​ | ​
As of December 31, 2018 |  | cost |  | amortization |  | Net
Customer lists | ​ | $ | 52,200 | ​ | $ | (14,549) | ​ | $ | 37,651
Tradenames | ​ | ​ | 20,689 | ​ | ​ | (5,884) | ​ | ​ | 14,805
Technology | ​ | ​ | 15,581 | ​ | ​ | (6,005) | ​ | ​ | 9,576
Total | ​ | $ | 88,470 | ​ | $ | (26,438) | ​ | $ | 62,032
Accrued Expenses and Other Current Liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
As of December 31 |  | 2019 |  | 2018
Compensation related liabilities | ​ | $ | 19,566 | ​ | $ | 18,717
Contingent consideration (A) | ​ | ​ | - | ​ | ​ | 8,602
Product warranty and recall obligations | ​ | ​ | 7,685 | ​ | ​ | 7,211
Other (B) | ​ | ​ | 27,972 | ​ | ​ | 23,350
Total accrued expenses and other current liabilities | ​ | $ | 55,223 | ​ | $ | 57,880
(A) | Accrued contingent consideration includes the Orlaco earn-out consideration, as referenced in Note 2 and Note 10, and is included in accrued expenses and other current liabilities for the year ended December 31, 2018. Orlaco earn-out consideration of $8,474 was paid in March 2019.
(B) | “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 |  | 2019 |  | 2018
Product warranty and recall at beginning of period | ​ | $ | 10,494 | ​ | $ | 9,979
Accruals for warranties established during period | ​ | ​ | 7,131 | ​ | ​ | 6,217
Aggregate changes in pre-existing liabilities due to claim developments | ​ | ​ | 1,037 | ​ | ​ | 646
Settlements made during the period | ​ | ​ | (7,600) | ​ | ​ | (5,831)
Foreign currency translation | ​ | ​ | (266) | ​ | ​ | (517)
Product warranty and recall at end of period | ​ | $ | 10,796 | ​ | $ | 10,494
Schedule of Weighted-Average Number of Shares | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31, | ​ | 2019 |  | 2018 |  | 2017
Basic weighted-average Common Shares outstanding | ​ | 27,791,799 | ​ | 28,402,227 | ​ | 28,082,114
Effect of dilutive shares | ​ | 478,296 | ​ | 677,599 | ​ | 689,531
Diluted weighted-average Common Shares outstanding | ​ | 28,270,095 | ​ | 29,079,826 | ​ | 28,771,645
Changes in Accumulated Other Comprehensive Loss by Component | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Foreign | ​ | Unrealized | ​ | ​ | ​
​ | ​ | currency | ​ | gain (loss) | ​ | ​ | ​
​ |  | translation |  | on derivatives |  | Total
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)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at January 1, 2018 | ​ | $ | (69,417) | ​ | $ | (143) | ​ | $ | (69,560)
Other comprehensive (loss) income before reclassifications | ​ | ​ | (16,627) | ​ | ​ | 1,448 | ​ | ​ | (15,179)
Amounts reclassified from accumulated other comprehensive loss | ​ | ​ | - | ​ | ​ | (1,013) | ​ | ​ | (1,013)
Net other comprehensive (loss) income, net of tax | ​ | ​ | (16,627) | ​ | ​ | 435 | ​ | ​ | (16,192)
Balance at December 31, 2018 | ​ | $ | (86,044) | ​ | $ | 292 | ​ | $ | (85,752)

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