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Debt (Schedule of Debt) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |
Revolving credit facility | $ 108,500 | $ 96,000
Debt: |  |
Total debt | 3,311 | 2,516
Less: current portion | (2,752) | (1,533)
Total long-term debt, net | 559 | 983
Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Revolving credit facility | $ 108,500 | 96,000
Debt: |  |
Debt, maturity | June 2024 |
Suzhou Short-Term Credit Line [Member] |  |
Debt Instrument [Line Items] |  |
Revolving credit facility | $ 2,099 | 0
Debt: |  |
Debt, maturity | August 2020 |
Maximum [Member] | Revolving Credit Facility [Member] |  |
Debt: |  |
Long-term debt, weighted average interest rate | 3.12% |
Maximum [Member] | Suzhou Short-Term Credit Line [Member] |  |
Debt: |  |
Outstanding credit lines interest rate | 5.00% |
Minimum [Member] | Revolving Credit Facility [Member] |  |
Debt: |  |
Long-term debt, weighted average interest rate | 3.07% |
Minimum [Member] | Suzhou Short-Term Credit Line [Member] |  |
Debt: |  |
Outstanding credit lines interest rate | 4.70% |
PST Short-Term Obligations [Member] |  |
Debt Instrument [Line Items] |  |
Short-term debt | $ 149 | 989
Debt: |  |
Debt, maturity | December 2019 |
Interest rate | 6.00% |
PST Long-Term Notes [Member] |  |
Debt: |  |
Long-term debt | $ 1,063 | $ 1,527
Debt, maturity | November 2021 |
Interest rate | 7.00% |

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