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Debt - ST Debt (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Short-term Debt [Line Items] |  |
Short-term Borrowings | $ 33,843 | $ 61,210
Short-term Debt, Weighted Average Interest Rate | 3.60% | 1.90%

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