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Contingencies And Other Disclosures (Schedule Of Original Purchase Amount Of Investments Subject To Litigation) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Mar. 25, 2014
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Alternativea Mortgage Loan Pools [Member] | Senior Investor Rank [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Original purchase amounts of the investments at issue | $ 482,085 |  |
Ending balance of the investments at issue |  |  | 190,088
Alternativea Mortgage Loan Pools [Member] | Junior Investor Rank [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Original purchase amounts of the investments at issue | 0 |  |
Ending balance of the investments at issue |  |  | 0
Alternativea Mortgage Loan Pools [Member] | 2005 [Member] | Senior Investor Rank [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Original purchase amounts of the investments at issue | 200,118 | [1] |
Ending balance of the investments at issue |  |  | 59,230
Alternativea Mortgage Loan Pools [Member] | 2005 [Member] | Junior Investor Rank [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Original purchase amounts of the investments at issue | 0 |  |
Ending balance of the investments at issue |  |  | 0
Alternativea Mortgage Loan Pools [Member] | 2006 [Member] | Senior Investor Rank [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Original purchase amounts of the investments at issue | 77,906 | [1] |
Ending balance of the investments at issue |  |  | 36,254
Alternativea Mortgage Loan Pools [Member] | 2006 [Member] | Junior Investor Rank [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Original purchase amounts of the investments at issue | 0 |  |
Ending balance of the investments at issue |  |  | 0
Alternativea Mortgage Loan Pools [Member] | 2007 [Member] | Senior Investor Rank [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Original purchase amounts of the investments at issue | 204,061 |  |
Ending balance of the investments at issue |  |  | 94,604
Alternativea Mortgage Loan Pools [Member] | 2007 [Member] | Junior Investor Rank [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Original purchase amounts of the investments at issue | 0 |  |
Ending balance of the investments at issue |  |  | 0
Jumbo Mortgage Loans [Member] | Senior Investor Rank [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Original purchase amounts of the investments at issue | 80,000 |  |
Ending balance of the investments at issue |  |  | 26,625
Jumbo Mortgage Loans [Member] | Junior Investor Rank [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Original purchase amounts of the investments at issue | 16,877 |  |
Ending balance of the investments at issue |  |  | 1,614
Jumbo Mortgage Loans [Member] | 2005 [Member] | Senior Investor Rank [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Original purchase amounts of the investments at issue | 30,000 |  |
Ending balance of the investments at issue |  |  | 10,665
Jumbo Mortgage Loans [Member] | 2005 [Member] | Junior Investor Rank [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Original purchase amounts of the investments at issue | 0 |  |
Ending balance of the investments at issue |  |  | 0
Jumbo Mortgage Loans [Member] | 2006 [Member] | Senior Investor Rank [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Original purchase amounts of the investments at issue | 0 |  |
Ending balance of the investments at issue |  |  | 0
Jumbo Mortgage Loans [Member] | 2006 [Member] | Junior Investor Rank [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Original purchase amounts of the investments at issue | 9,793 |  |
Ending balance of the investments at issue |  |  | 1,614
Jumbo Mortgage Loans [Member] | 2007 [Member] | Senior Investor Rank [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Original purchase amounts of the investments at issue | 50,000 |  |
Ending balance of the investments at issue |  |  | 15,960
Jumbo Mortgage Loans [Member] | 2007 [Member] | Junior Investor Rank [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Original purchase amounts of the investments at issue | 7,084 |  |
Ending balance of the investments at issue |  |  | 0
Federal Housing Finance Agency [Member] | Alternativea Mortgage Loan Pools [Member] | 2005 [Member] | Senior Investor Rank [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Original purchase amounts of the investments at issue | 643,751 |  |
Federal Housing Finance Agency [Member] | Alternativea Mortgage Loan Pools [Member] | 2006 [Member] | Senior Investor Rank [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Original purchase amounts of the investments at issue | $ 230,020 |  |
[1] | Excluded from the amounts shown in the table are certificates which were the subject of the FHFA litigation; $230,020 of Senior Alt-A loans from 2006 and $643,751 of Senior Alt-A loans from 2005. The FHFA litigation was pending at quarter-end but was settled in April 2014.

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