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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 16, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | [1] | Jun. 30, 2017 | [1] | Mar. 31, 2017 | [1] | Dec. 31, 2016 | Sep. 30, 2016 | [2] | Jun. 30, 2016 | [2] | Mar. 31, 2016 | [2] | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2011 | Dec. 31, 2010
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) on operations |  | $ (6,036) | [1] | $ 3,809 | $ 5,189 | $ 4,571 | $ (39,503) | [2] | $ 919 | $ 1,350 | $ 845 | $ 7,533 | $ (36,389) | $ (547) |  |
Effective income tax rate |  |  |  |  |  |  |  |  |  |  |  | 14.30% | (92.80%) | (2.70%) |  |
Unremitted earnings of foreign subsidiaries |  | 47,860 |  |  |  |  |  |  |  |  |  | $ 47,860 |  |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  |  |  |  |  |  |  |  |  |  | (15,269) |  |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  |  |  |  |  |  |  |  |  |  |  | 6,207 |  |  |  |
Income Tax, Expense (Benefit) from Tax Legislation |  |  |  |  |  |  |  |  |  |  |  | (9,062) |  |  |  |
General business tax credit carry forwards, expiration date |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2023 |  |  |
Reduction of noncurrent deferred tax asset |  |  |  |  |  |  |  |  |  |  |  | (15,269) |  |  |  |
Liability for uncertain tax positions reduction to noncurrent asset |  | 3,218 |  |  |  |  |  |  |  |  |  | 3,218 |  |  |  |
Liability for uncertain tax positions, noncurrent |  | 444 |  |  |  |  |  |  |  |  |  | 444 |  |  |  |
Unrecognized tax benefits that would impact effective tax rate |  |  |  |  |  |  | 3,645 |  |  |  |  |  | $ 3,645 | $ 3,821 |  |
Gross interest and penalties expense (benefit) |  |  |  |  |  |  |  |  |  |  |  | (33) | (59) | $ (90) |  |
Accrued payment of interest and penalties |  | 32 |  |  |  |  | $ 64 |  |  |  |  | 32 | $ 64 |  |  |
Defered Tax Liability, Investments, Change in Basis during the Period |  |  |  |  |  |  |  |  |  |  |  | 8,100 |  |  |  |
Increase in equity method investment, ownership percentage | 26.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carry forwards |  | 42,571 |  |  |  |  |  |  |  |  |  | 42,571 |  |  |  |
General business and foreign tax credit carry forwards |  | 1,753 |  |  |  |  |  |  |  |  |  | 1,753 |  |  |  |
Foreign Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carry forwards |  | 35,075 |  |  |  |  |  |  |  |  |  | 35,075 |  |  |  |
General business and foreign tax credit carry forwards |  | 1,023 |  |  |  |  |  |  |  |  |  | 1,023 |  |  |  |
U.S. Federal [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General business and foreign tax credit carry forwards |  | $ 27,336 |  |  |  |  |  |  |  |  |  | $ 27,336 |  |  |  |
PST Eletronica Ltda [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Increase in equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24.00% |
[1] | The impact of the Tax Legislation was an increase in tax expense of $6.2 million due to the one-time deemed repatriation tax, offset by the favorable impacts of the reduced tax rate on the Company's net deferred tax liabilities and other deferred tax adjustments of $(15.3) million related to certain earnings included in the one-time transition tax.
[2] | The Company recorded the release of a valuation allowance associated with its U.S. federal, certain state and foreign deferred tax assets for the year ended December 31, 2016.

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