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Investments (Mortgage Loans by Credit Quality Indicator) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 4,450,291 | $ 4,413,171
Loans Receivable, Gross, Commercial, Construction | $ 12,279 | $ 9,686
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 100.00% | 100.00%
Mortgage Loans By Credit Quality Indicator Range Four [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 160,433 | $ 167,611
Loans Receivable, Gross, Commercial, Construction | $ 0 | $ 9,686
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 3.60% | 3.80%
Mortgage Loans By Credit Quality Indicator Range Three [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 418,769 | $ 431,274
Loans Receivable, Gross, Commercial, Construction | $ 0 | $ 0
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 9.40% | 9.80%
Mortgage Loans By Credit Quality Indicator Range Two [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 1,617,873 | $ 1,608,078
Loans Receivable, Gross, Commercial, Construction | $ 0 | $ 0
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 36.40% | 36.40%
Mortgage Loans By Credit Quality Indicator Range One [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 2,253,216 | $ 2,206,208
Loans Receivable, Gross, Commercial, Construction | $ 12,279 | $ 0
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 50.60% | 50.00%
Debt Service Coverage Ratio Range Three [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 110,105 | $ 69,451
Debt Service Coverage Ratio Range Three [Member] | Mortgage Loans By Credit Quality Indicator Range Four [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 4,276 | 6,362
Debt Service Coverage Ratio Range Three [Member] | Mortgage Loans By Credit Quality Indicator Range Three [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 30,904 | 15,367
Debt Service Coverage Ratio Range Three [Member] | Mortgage Loans By Credit Quality Indicator Range Two [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 68,070 | 43,921
Debt Service Coverage Ratio Range Three [Member] | Mortgage Loans By Credit Quality Indicator Range One [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 6,855 | 3,801
Debt Service Coverage Ratio Range Two [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 167,712 | 151,281
Debt Service Coverage Ratio Range Two [Member] | Mortgage Loans By Credit Quality Indicator Range Four [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 30,497 | 30,713
Debt Service Coverage Ratio Range Two [Member] | Mortgage Loans By Credit Quality Indicator Range Three [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 27,682 | 19,461
Debt Service Coverage Ratio Range Two [Member] | Mortgage Loans By Credit Quality Indicator Range Two [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 29,795 | 47,128
Debt Service Coverage Ratio Range Two [Member] | Mortgage Loans By Credit Quality Indicator Range One [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 79,738 | 53,979
Debt Service Coverage Ratio Range One [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 4,160,195 | 4,182,753
Debt Service Coverage Ratio Range One [Member] | Mortgage Loans By Credit Quality Indicator Range Four [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 125,660 | 120,850
Debt Service Coverage Ratio Range One [Member] | Mortgage Loans By Credit Quality Indicator Range Three [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 360,183 | 396,446
Debt Service Coverage Ratio Range One [Member] | Mortgage Loans By Credit Quality Indicator Range Two [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 1,520,008 | 1,517,029
Debt Service Coverage Ratio Range One [Member] | Mortgage Loans By Credit Quality Indicator Range One [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 2,154,344 | $ 2,148,428

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- 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 Amount before allowance of commercial construction loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5066-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5066-111524 + Details
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