Quarterly report pursuant to Section 13 or 15(d)

Short Term Borrowings (Details)

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Short Term Borrowings (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Short-term Debt [Line Items]      
Short Term Borrowings $ 1,504,086 $ 1,441,092 $ 2,051,258