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Derivative Instruments (Derivative Assets 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 Assets [Line Items]  
Gross Amounts of Recognized Assets $ 12,090
Net Amounts of Assets presented in the Statement of Financial Position 12,090
Fair Value of collateral 12,090
Total of Gross amounts not offset in the statement of financial position included applicable netting agreement and fair value of collateral 12,090
Net Amount