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Mortgage Loans on Real Estate Schedule of Impaired Financing Receivables (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | $ 29,976 | $ 44,034 | $ 17,803
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 27,765 | 63,023 | 81,994
Impaired Financing Receivable, Recorded Investment | 57,741 | 107,057 | 99,797
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 53,110 | 67,698 | 31,027
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 27,765 | 63,023 | 81,994
Impaired Financing Receivable, Unpaid Principal Balance | 80,875 | 130,721 | 113,021
Impaired Financing Receivable, Related Allowance | (23,134) | (23,664) | (13,224)
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 37,480 | 53,617 | 24,062
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 27,696 | 60,974 | 82,535
Impaired Financing Receivable, Average Recorded Investment | 65,176 | 114,591 | 106,597
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 1,946 | 3,284 | 656
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 1,664 | 3,509 | 4,921
Impaired Financing Receivable, Interest Income, Accrual Method | $ 3,610 | $ 6,793 | $ 5,577

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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