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Summary of Significant Accounting Policies (Narrative) (Details) € in Thousands, R$ in Thousands, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended | 65 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2017 BRL (R$) shares | May 15, 2017 | Mar. 31, 2018 USD ($) | Mar. 31, 2018 EUR (€) | May 16, 2017
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  | $ 24,904 | $ 22,786 | $ 21,490 |  |  |  |  |
Less: Net loss attributable to noncontrolling interest |  |  |  |  | (130) |  |  |  |  |
Preproduction costs related to long-term supply arrangements, costs capitalized |  |  | 7,666 | 6,875 |  |  |  |  |  |
Impairment of Goodwill |  |  | 0 | 0 | 0 |  |  |  |  |
Intangible assets, net |  |  | 58,122 | 62,032 |  |  |  |  |  |
Amortization |  |  | 5,955 | 6,406 | 6,440 |  |  |  |  |
Amortization expense next year |  |  | 5,722 |  |  |  |  |  |  |
Amortization expense year two |  |  | 5,722 |  |  |  |  |  |  |
Amortization expense year three |  |  | 5,722 |  |  |  |  |  |  |
Amortization expense year four |  |  | 5,722 |  |  |  |  |  |  |
Amortization expense year five |  |  | $ 5,722 |  |  |  |  |  |  |
Intangible assets, weighted-average remaining amortization period, years |  |  | 11 years |  |  |  |  |  |  |
Intangible impairment charge |  |  | $ 0 | 202 | 0 |  |  |  |  |
Design and development expense |  |  | $ 52,198 | $ 51,074 | $ 48,877 |  |  |  |  |
Design and development expense percentage |  |  | 6.30% | 5.90% | 5.90% | 5.90% |  |  |  |
Research and development expense reimbursed |  |  | $ 15,096 | $ 16,540 | $ 14,946 |  |  |  |  |
Share-based compensation expense |  |  | 6,191 | 5,632 | 7,265 |  |  |  |  |
Share-based compensation expense capitalized as inventory |  |  | 0 | 0 | 0 |  |  |  |  |
Cumulative goodwill impairment |  |  | 300,083 | 300,083 |  |  |  |  |  |
Product warranty and recall accrual |  |  | 3,111 | 3,283 |  |  |  |  |  |
Inventory amount, FIFO |  |  | 82,910 | 64,745 |  |  |  |  |  |
Inventory amount, weighted average cost |  |  | 10,539 | 14,533 |  |  |  |  |  |
Foreign currency transaction gain (loss) |  |  | (372) | 487 | (500) |  |  |  |  |
Amortization of financing costs |  |  | 624 | 326 | 324 |  |  |  |  |
Interest expense, net |  |  | (4,324) | (4,720) | (5,783) |  |  |  |  |
Deferred financing costs, net |  |  | 1,625 | 882 |  |  |  |  |  |
Operating lease right-of-use asset |  |  | 22,027 |  |  |  |  |  |  |
Operating lease liability |  |  | 22,527 |  |  |  |  |  |  |
Earn-out consideration, operating and financing activities | $ 8,474 | $ 8,474 |  |  |  |  |  |  |  |
Payment of earn-out consideration paid within operating activities |  |  | 2,308 | 213 | 7,485 |  |  |  |  |
Earn-out consideration cash payment within financing activities |  |  | 3,394 |  |  |  |  |  |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  | 6,191 | 5,632 | 7,265 |  |  |  |  |
Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Preproduction costs related to long-term supply arrangements, costs capitalized |  |  | 7,544 | 6,875 |  |  |  |  |  |
Electronics [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible impairment charge |  |  |  | 202 |  |  |  |  |  |
Interest expense, net |  |  | (350) | (85) | (119) |  |  |  |  |
Stoneridge Brazil [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Accounts receivable sold |  |  | 0 | 0 | 2,520 | R$ 7,983 |  |  |  |
Gain (loss) on sale of accounts receivable |  |  |  |  | (86) | 273 |  |  |  |
Proceeds from sale of accounts receivable |  |  |  |  | 2,434 | R$ 7,710 |  |  |  |
Interest expense, net |  |  | (208) | (824) | (1,812) |  |  |  |  |
Control Devices [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  | $ (811) | $ (76) | $ (103) |  |  |  |  |
Performance Based Right to Receive Common Shares [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Common shares, non-vested | shares |  |  | 566,337 | 628,220 | 766,538 | 766,538 |  |  |  |
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number | shares |  |  | 566,337 | 628,220 | 766,538 | 766,538 |  |  |  |
Customer Lists [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  | $ 33,284 | $ 37,651 |  |  |  |  |  |
Customer Lists [Member] | Electronics [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  | 23,019 |  |  |  |  |  |  |
Customer Lists [Member] | Stoneridge Brazil [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  | 10,265 |  |  |  |  |  |  |
Trade Names [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  | 13,354 | 14,805 |  |  |  |  |  |
Trade Names [Member] | Electronics [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  | 4,561 |  |  |  |  |  |  |
Trade Names [Member] | Stoneridge Brazil [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  | 8,793 |  |  |  |  |  |  |
Technology [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  | 7,878 | $ 9,576 |  |  |  |  |  |
Technology [Member] | Electronics [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  | 3,498 |  |  |  |  |  |  |
Technology [Member] | Stoneridge Brazil [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  | 4,270 |  |  |  |  |  |  |
Technology [Member] | Control Devices [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  | 110 |  |  |  |  |  |  |
Capitalized Software Development [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  | 3,606 |  |  |  |  |  |  |
Capitalized Software Development [Member] | Electronics [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  | 2,233 |  |  |  |  |  |  |
Capitalized Software Development [Member] | Control Devices [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  | $ 1,373 |  |  |  |  |  |  |
Stoneridge Brazil [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage ownership in consolidated subsidiary |  |  |  |  |  |  | 74.00% |  |  |
Percentage of additional noncontrolling interest acquired |  |  |  |  |  |  |  |  |  | 26.00%
Less: Net loss attributable to noncontrolling interest |  |  |  |  | $ 130 |  |  |  |  |
MSIL |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  | 49.00% | 49.00% | 49.00% | 49.00% |  |  |  |
Equity method investments |  |  | $ 12,701 | $ 11,288 |  |  |  |  |  |
Maximum [Member] | Pre-production Costs [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  | 7 years |  |  |  |  |  |  |
Maximum [Member] | Capitalized Software Development [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  | P7Y |  |  |  |  |  |  |
Minimum [Member] | Pre-production Costs [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  | 3 years |  |  |  |  |  |  |
Minimum [Member] | Capitalized Software Development [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  | P3Y |  |  |  |  |  |  |
Orlaco [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Payment of earn-out consideration paid within operating activities |  |  | $ 5,080 |  |  |  |  |  |  |
Earn-out consideration cash payment within financing activities |  |  | 3,394 |  |  |  |  |  |  |
Earn-out consideration |  |  |  |  |  |  |  | $ 7,500 | € 7,500 |
Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization of financing costs |  |  | 1,366 |  |  |  |  |  |  |
Interest expense, net |  |  | $ (275) |  |  |  |  |  |  |

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