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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | [1] | Jun. 30, 2016 | [1] | Mar. 31, 2016 | [1] | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2011 | Dec. 31, 2010
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) on operations | $ (39,503) | [1] | $ 919 | $ 1,350 | $ 845 | $ (345) | $ 32 | $ (381) | $ 147 | $ (36,389) | $ (547) | $ (1,856) |  |
Effective income tax rate |  |  |  |  |  |  |  |  |  | (92.80%) | (2.70%) | (3.50%) |  |
Unremitted earnings of foreign subsidiaries | 44,898 |  |  |  |  |  |  |  |  | $ 44,898 |  |  |  |
General business tax credit carry forwards, expiration date |  |  |  |  |  |  |  |  |  | Dec. 31, 2021 |  |  |  |
Liability for uncertain tax positions reduction to noncurrent asset | 3,731 |  |  |  |  |  |  |  |  | $ 3,731 |  |  |  |
Liability for uncertain tax positions, noncurrent | 146 |  |  |  |  |  |  |  |  | 146 |  |  |  |
Unrecognized tax benefits that would impact effective tax rate | 3,821 |  |  |  |  | 4,280 |  |  |  | 3,821 | $ 4,280 |  |  |
Gross interest and penalties expense (benefit) |  |  |  |  |  |  |  |  |  | (59) | (90) | $ (411) |  |
Accrued payment of interest and penalties | 64 |  |  |  |  | $ 123 |  |  |  | 64 | $ 123 |  |  |
Goodwill impairment charge (benefit) |  |  |  |  |  |  |  |  |  |  |  | $ 51,458 |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carry forwards | 41,222 |  |  |  |  |  |  |  |  | 41,222 |  |  |  |
General business and foreign tax credit carry forwards | 1,530 |  |  |  |  |  |  |  |  | 1,530 |  |  |  |
Foreign Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carry forwards | 35,849 |  |  |  |  |  |  |  |  | 35,849 |  |  |  |
General business and foreign tax credit carry forwards | 1,510 |  |  |  |  |  |  |  |  | 1,510 |  |  |  |
U.S. Federal [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carry forwards | 53,064 |  |  |  |  |  |  |  |  | $ 53,064 |  |  |  |
Operating loss carry forwards, expiration dates |  |  |  |  |  |  |  |  |  | Dec. 31, 2026 |  |  |  |
General business and foreign tax credit carry forwards | $ 15,254 |  |  |  |  |  |  |  |  | $ 15,254 |  |  |  |
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 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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