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Fair Values of Assets and Liabilities, Other Relevant Data (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 30, 2005 | May 31, 2005
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Structured Financing Notes Payable [Member] |  |  |  |
Schedule of Fair Value Assets And Liabilities [Line Items] |  |  |  |
Aggregate unpaid principal balance of notes payable | $ 101,314 | $ 102,035 |  |
Aggregate fair value of notes payable | 9,240 | 12,276 |  |
Loans and Fees Receivable, at Fair Value [Member] |  |  |  |
Schedule of Fair Value Assets And Liabilities [Line Items] |  |  |  |
Aggregate unpaid principal balance within loans and fees receivable that are reported at fair value | 4,416 | 6,251 |  |
Aggregate fair value of loans and fees receivable that are reported at fair value | 1,869 | 3,484 |  |
Aggregate fair value of receivables carried at fair value that are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) | 5 | 6 |  |
Aggregate excess of balance of unpaid principal receivables within loans and fees receivable that are reported at fair value and are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) over the fair value of such loans and fees receivable | 107 | 204 |  |
Loans and Fees Receivable Pledged as Collateral under Structured Financings, at Fair Value [Member] |  |  |  |
Schedule of Fair Value Assets And Liabilities [Line Items] |  |  |  |
Aggregate unpaid principal balance within loans and fees receivable that are reported at fair value | 11,349 | 16,614 |  |
Aggregate fair value of loans and fees receivable that are reported at fair value | 9,240 | 12,164 |  |
Aggregate fair value of receivables carried at fair value that are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) | 17 | 22 |  |
Aggregate excess of balance of unpaid principal receivables within loans and fees receivable that are reported at fair value and are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) over the fair value of such loans and fees receivable | $ 369 | $ 562 |  |
5.875% Convertible Senior Notes Due 2035 [Member] |  |  |  |
Schedule of Fair Value Assets And Liabilities [Line Items] |  |  |  |
Interest rate on notes |  |  | 5.875% | 5.875%

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- Definition This item represents the aggregate fair value of notes payable for which the fair value option has been elected. + References No definition available. + Details
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- Definition This item represents the aggregate unpaid principal balance within notes payable that are reported at fair value for which the fair value option has been elected. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This item represents the aggregate fair value of loans held as assets that are 90 days or more past due for which the fair value option has been elected. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 + Details
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- Definition For loans held as assets for which the fair value option has been elected, this item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of those loans that are 90 days or more past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (e)(3) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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