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Derivative Instruments (Derivative Liabilities Offset In The Consolidated Balance Sheets) (Details) (Interest Rate Swap [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Interest Rate Swap [Member]
 
Offsetting Liabilities [Line Items]  
Gross Amounts of Recognized Liabilities $ 12,090
Net Amount of Liabilities presented in the Statement of Financial Position 12,090
Fair Value of collateral 11,839
Total Gross amounts not offset in the statement of position including applicable netting agreement and fair value of collateral 11,839
Net Amount $ 251