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Summary of Significant Accounting Policies (Narrative) (Details) BRL in Thousands, $ in Thousands |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 16, 2017 | May 15, 2017 | Aug. 01, 2014 USD ($) | May 26, 2014 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 BRL | Dec. 31, 2017 USD ($) | Dec. 31, 2016 BRL shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2010
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,490 |  | $ 19,998 | $ 18,964 |  |  |  |  |  |  |  |
Increase in equity method investment, ownership percentage | 26.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: income (loss) attributable to noncontrolling interest |  |  |  |  |  |  | $ (100) | $ (30) | $ 122 | $ (303) | $ (576) | $ (1,130) |  | (130) |  | (1,887) | (2,207) |  |  |  |  |  |  |  |
Preproduction costs related to long-term supply arrangements, costs capitalized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,260 | $ 6,859 |  |
Goodwill |  |  |  |  | $ 38,419 |  |  |  | 931 |  |  |  |  | 38,419 |  | 931 |  |  |  |  |  | 38,419 | 931 |  |
Goodwill, ending balance |  |  |  |  | 38,419 |  |  |  | 931 |  |  |  |  | 38,419 |  | 931 |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,243 | 39,260 |  |
Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,440 |  | 3,259 | 3,445 |  |  |  |  |  |  |  |
Amortization expense next year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,800 |  |  |
Amortization expense year two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,800 |  |  |
Amortization expense year three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,800 |  |  |
Amortization expense year four |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,800 |  |  |
Amortization expense year five |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,800 |  |  |
Intangible assets, weighted-average remaining amortization period, years |  |  |  |  |  |  |  |  |  |  |  |  | 13 years | 13 years |  |  |  |  |  |  |  |  |  |  |
Design and development expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 48,877 |  | $ 40,212 | $ 38,792 |  |  |  |  |  |  |  |
Design and development expense percentage |  |  |  |  |  |  |  |  |  |  |  |  | 5.90% | 5.90% | 5.80% | 5.80% | 6.00% |  |  |  |  |  |  |  |
Research and development expense reimbursed |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,946 |  | $ 12,764 | $ 9,659 |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,265 |  | 6,134 | 7,224 |  |  |  |  |  |  |  |
Share-based compensation expense capitalized as inventory |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 0 |  |  |  |  |  |  |  |
Amortization of financing costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 324 |  | 355 | 388 |  |  |  |  |  |  |  |
Deferred financing costs, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,208 | 1,471 |  |
Cumulative goodwill impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,083 | 300,083 |  |
Product warranty and recall accrual |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,112 | 2,617 |  |
Inventory amount, FIFO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 54,837 | 37,765 |  |
Inventory amount, weighted average cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,634 | 22,352 |  |
Foreign currency transaction gain (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | (500) |  | 268 | (1,693) |  |  |  |  |  |  |  |
Sales |  |  |  |  | 207,440 | $ 203,582 | $ 209,111 | $ 204,311 | 172,612 | $ 173,846 | $ 186,903 | $ 162,616 |  | 824,444 |  | 695,977 | 644,812 |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  | 576,304 |  | 500,538 | 467,834 |  |  |  |  |  |  |  |
Unrecognized tax benefits related to share-based payment awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,729 |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,265 |  | 6,134 |  |  |  |  |  |  |  |  |
CEO Retirement Additional Expense [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional stock compensation expense in connection with retirement of former President and CEO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,225 |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,224 |  |  |  |  |  |  |  |
Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preproduction costs related to long-term supply arrangements, costs capitalized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,894 | 6,446 |  |
Electronics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of business |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,628 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 38,419 |  |  |  | 931 |  |  |  |  | 38,419 |  | 931 | 981 |  |  |  |  | $ 38,419 | 931 | $ 981 |
Currency translation |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,860 |  | (50) |  |  |  |  |  |  |  |  |
Goodwill, ending balance |  |  |  |  | $ 38,419 |  |  |  | $ 931 |  |  |  |  | 38,419 |  | 931 | 981 |  |  |  |  |  |  |  |
PST [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable sold |  |  |  |  |  |  |  |  |  |  |  |  | BRL 7,983 | 2,520 | BRL 53,886 | 15,297 |  |  |  |  |  |  |  |  |
Gain (loss) on sale of accounts receivable |  |  |  |  |  |  |  |  |  |  |  |  | (273) | (86) | (1,615) | (459) |  |  |  |  |  |  |  |  |
Proceeds from sale of accounts receivable |  |  |  |  |  |  |  |  |  |  |  |  | BRL 7,710 | 2,434 | 52,271 | 14,838 |  |  |  |  |  |  |  |  |
Remaining credit exposure |  |  |  |  |  |  |  |  |  |  |  |  |  |  | BRL 3,476 |  |  |  |  |  |  |  | $ 1,067 |  |
Long Term Cash Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 |  | (117) | $ 828 |  |  |  |  |  |  |  |
Restricted Stock [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional stock compensation expense in connection with retirement provision modificaton |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 545 |  |  |  |  |  |  |  |  |
Performance Based Restricted Common Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares, non-vested | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 134,250 |
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 134,250 |
Performance Based Right to Received Common Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares, non-vested | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 843,140 |  |  |  |  |  |  | 766,538 | 843,140 | 573,885 |
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 843,140 |  |  |  |  |  |  | 766,538 | 843,140 | 573,885 |
Customer Lists [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 44,977 | $ 18,338 |  |
Customer Lists [Member] | Electronics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28,963 |  |  |
Customer Lists [Member] | PST [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,014 |  |  |
Trade Names [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,900 | 13,558 |  |
Trade Names [Member] | Electronics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,452 |  |  |
Trade Names [Member] | PST [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,448 |  |  |
Technology [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,366 | $ 7,364 |  |
Technology [Member] | Electronics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,808 |  |  |
Technology [Member] | PST [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,558 |  |  |
PST Eletronica Ltda [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Percentage ownership in consolidated subsidiary |  | 74.00% |  |  |  |  |  |  |  |  |  |  |  |  | 74.00% | 74.00% | 74.00% | 74.00% | 74.00% | 74.00% |  |  |  |  |
Increase in equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24.00% |  |  |  |
Dividend from noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  | (14,458) |  |  |  |  |  |  |  |  |  |  |
Less: income (loss) attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 130 |  | $ 1,887 | $ 2,207 |  |  |  |  |  |  |  |
Minda Stoneridge Instruments Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00% |  |  |  |  |  |  | 49.00% | 49.00% | 49.00% |
Equity method investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,131 | $ 7,952 |  |
Maximum [Member] | Pre-production Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  |  |  |  |  |  |  |  |  | 5 years | 5 years | 5 years | 5 years |  |  |  |  |  |  |  |  |
Minimum [Member] | Pre-production Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  |  |  |  |  |  |  |  |  |  | 3 years | 3 years | 3 years | 3 years |  |  |  |  |  |  |  |  |
Wiring [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on disposal, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (210) |  |  |  |  |  |  |  |
Income tax provision on loss on disposal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (31) |  |  |  |  |  |  |  |
Proceeds from (payments related to) sale of business |  |  | $ 71,386 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preliminary sales price |  |  |  | $ 65,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for working capital adjustment related to segment sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,230 |  |  |  |  |  |  |  |

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