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Investments (Mortgage Loans by Credit Quality Indicator) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 5,667,354 | $ 4,983,354
Loans Receivable, Gross, Commercial, Construction | $ 21,434 | $ 32,620
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 100.00% | 100.00%
LTV 0 to 59 Percent [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 3,038,993 | $ 2,523,670
Loans Receivable, Gross, Commercial, Construction | $ 21,434 | $ 13,691
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 53.60% | 50.60%
LTV 60 To 69 Percent [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 2,011,116 | $ 1,749,331
Loans Receivable, Gross, Commercial, Construction | $ 0 | $ 18,929
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 35.50% | 35.10%
LTV 70 To 79 Percent [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 428,185 | $ 517,147
Loans Receivable, Gross, Commercial, Construction | $ 0 | $ 0
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 7.60% | 10.40%
Debt-to-Value Ratio, 80 to 100 Percent [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 189,060 | $ 193,206
Loans Receivable, Gross, Commercial, Construction | $ 0 | $ 0
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 3.30% | 3.90%
Debt Service Coverage Ratio Range One [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 5,314,858 | $ 4,561,177
Debt Service Coverage Ratio Range One [Member] | LTV 0 to 59 Percent [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 2,912,673 | 2,410,556
Debt Service Coverage Ratio Range One [Member] | LTV 60 To 69 Percent [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 1,889,981 | 1,618,374
Debt Service Coverage Ratio Range One [Member] | LTV 70 To 79 Percent [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 395,599 | 414,269
Debt Service Coverage Ratio Range One [Member] | Debt-to-Value Ratio, 80 to 100 Percent [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 116,605 | 117,978
Debt Service Coverage Ratio Range Two [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 224,855 | 233,260
Debt Service Coverage Ratio Range Two [Member] | LTV 0 to 59 Percent [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 91,954 | 61,246
Debt Service Coverage Ratio Range Two [Member] | LTV 60 To 69 Percent [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 83,814 | 73,908
Debt Service Coverage Ratio Range Two [Member] | LTV 70 To 79 Percent [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | 48,438
Debt Service Coverage Ratio Range Two [Member] | Debt-to-Value Ratio, 80 to 100 Percent [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 49,087 | 49,668
Debt Service Coverage Ratio Range Three [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 106,207 | 156,297
Debt Service Coverage Ratio Range Three [Member] | LTV 0 to 59 Percent [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 12,932 | 38,177
Debt Service Coverage Ratio Range Three [Member] | LTV 60 To 69 Percent [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 37,321 | 38,120
Debt Service Coverage Ratio Range Three [Member] | LTV 70 To 79 Percent [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 32,586 | 54,440
Debt Service Coverage Ratio Range Three [Member] | Debt-to-Value Ratio, 80 to 100 Percent [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 23,368 | $ 25,560

X
- Definition The amount represents the total percentage of each property type in comparison to the total of mortgage loans whose balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References No definition available. + Details
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- Definition This element represents the carrying value of a short-term real estate loan to finance building costs. The funds are disbursed as needed or in accordance with a prearranged plan; generally, a portion of the funds is disbursed at inception and the remainder as construction progresses. The money is repaid on completion of the project, usually from the proceeds of a mortgage loan. The rate is normally higher than the prime rate, and there is usually an origination fee. The effective yield on these loans tends to be high, and the lender has a security interest in the real property. Note that there are separate concepts for the current and noncurrent portions of long-term construction loans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, before allowance for credit loss, of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447 + Details
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