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Debt (Schedule of Debt) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014 | Oct. 04, 2010
Debt Instrument [Line Items] |  |  |  |
Revolving credit facility | $ 100,000 | $ 100,000 | $ 100,000 |
Debt: |  |  |  |
Total debt | 27,632 | 27,632 | 30,306 |
Less: current portion | (20,618) | (20,618) | (19,655) |
Total long-term debt, net | 7,014 | 7,014 | 10,651 |
Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Revolving credit facility | $ 100,000 | $ 100,000 | 100,000 |
Debt: |  |  |  |
Debt interest rate | 1.84% | 1.84% |  |
Debt, maturity |  | September - 2019 |  |
Senior Notes [Member] |  |  |  |
Debt: |  |  |  |
Debt interest rate |  |  |  | 9.50%
PST Short-Term Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term debt | $ 15,124 | $ 15,124 | 11,249 |
Debt: |  |  |  |
Debt, maturity |  | Various 2015 and 2016 |  |
PST Short-Term Notes [Member] | Maximum [Member] |  |  |  |
Debt: |  |  |  |
Interest rate maximum | 19.20% |  |  |
PST Short-Term Notes [Member] | Minimum [Member] |  |  |  |
Debt: |  |  |  |
Interest rate minimum | 14.40% |  |  |
PST Long-Term Notes [Member] |  |  |  |
Debt: |  |  |  |
Total long-term debt, net | $ 11,977 | $ 11,977 | 16,770 |
Debt maturity period range start |  | 2016 |  |
Debt maturity period range end |  | 2021 |  |
PST Long-Term Notes [Member] | Maximum [Member] |  |  |  |
Debt: |  |  |  |
Interest rate maximum | 8.00% |  |  |
PST Long-Term Notes [Member] | Minimum [Member] |  |  |  |
Debt: |  |  |  |
Interest rate minimum | 5.50% |  |  |
Other [Member] |  |  |  |
Debt: |  |  |  |
Total debt | $ 531 | $ 531 | 837 |
Suzhou Note [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term debt |  |  | $ 1,450 |
Debt: |  |  |  |
Debt, maturity |  | April 2015 |  |

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