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Debt (Schedule of Debt) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Debt: |  |  |  |
Total debt | $ 205,636 |  | $ 197,232 |
Less: current portion | (21,559) |  | (12,187) |
Total long-term debt, net | 184,077 |  | 185,045 |
Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facilities |  |  |  |
Debt: |  |  |  |
Debt, maturity | Dec - 2016 |  |  |
Senior Notes [Member] |  |  |  |
Debt: |  |  |  |
Long-term debt | 173,356 | [1] | 173,061 | [1]
Debt, maturity | Oct - 2017 | [1] |  |
Long-term debt, weighted average interest rate | 9.50% | [1] |  |
PST Short-Term Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term debt | 13,049 |  | 4,822 |
Debt: |  |  |  |
Debt, maturity | Various 2014 |  |  |
PST Short-Term Notes [Member] | Maximum [Member] |  |  |  |
Debt: |  |  |  |
Interest rate maximum | 11.76% |  |  |
PST Short-Term Notes [Member] | Minimum [Member] |  |  |  |
Debt: |  |  |  |
Interest rate minimum | 1.90% |  |  |
PST Long-Term Notes [Member] |  |  |  |
Debt: |  |  |  |
Long-term debt | 16,753 |  | 16,896 |
Debt maturity period range start | 2014 |  |  |
Debt maturity period range end | 2019 |  |  |
PST Long-Term Notes [Member] | Maximum [Member] |  |  |  |
Debt: |  |  |  |
Interest rate maximum | 5.50% |  |  |
PST Long-Term Notes [Member] | Minimum [Member] |  |  |  |
Debt: |  |  |  |
Interest rate minimum | 4.00% |  |  |
Other [Member] |  |  |  |
Debt: |  |  |  |
Total debt | 1,030 |  | 966 |
Suzhou Note [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term debt | $ 1,448 |  | $ 1,487 |
Debt: |  |  |  |
Debt, maturity | Aug - 2014 |  |  |
Long-term debt, weighted average interest rate | 7.39% |  |  |
[1] | Interest rate excludes the effect of the Company's interest rate swap and the accretion of debt discount.

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