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Investments (Mortgage Loans by Credit Quality Indicator) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 4,794,226 | $ 4,413,171
Loans Receivable, Gross, Commercial, Construction | $ 25,724 | $ 9,686
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 100.00% | 100.00%
LTV 0 to 59 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 2,279,405 | $ 2,206,208
Loans Receivable, Gross, Commercial, Construction | $ 25,724 | $ 0
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 47.60% | 50.00%
LTV 60 To 69 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 1,846,868 | $ 1,608,078
Loans Receivable, Gross, Commercial, Construction | $ 0 | $ 0
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 38.50% | 36.40%
LTV 70 To 79 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 533,075 | $ 431,274
Loans Receivable, Gross, Commercial, Construction | $ 0 | $ 0
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 11.10% | 9.80%
LTV 80 to 100 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 134,878 | $ 167,611
Loans Receivable, Gross, Commercial, Construction | $ 0 | $ 9,686
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 2.80% | 3.80%
Debt Service Coverage Ratio Range One [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 4,307,296 | $ 4,182,753
Debt Service Coverage Ratio Range One [Member] | LTV 0 to 59 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 2,146,401 | 2,148,428
Debt Service Coverage Ratio Range One [Member] | LTV 60 To 69 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 1,666,525 | 1,517,029
Debt Service Coverage Ratio Range One [Member] | LTV 70 To 79 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 386,137 | 396,446
Debt Service Coverage Ratio Range One [Member] | LTV 80 to 100 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 108,233 | 120,850
Debt Service Coverage Ratio Range Two [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 274,833 | 151,281
Debt Service Coverage Ratio Range Two [Member] | LTV 0 to 59 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 63,794 | 53,979
Debt Service Coverage Ratio Range Two [Member] | LTV 60 To 69 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 117,726 | 47,128
Debt Service Coverage Ratio Range Two [Member] | LTV 70 To 79 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 70,884 | 19,461
Debt Service Coverage Ratio Range Two [Member] | LTV 80 to 100 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 22,429 | 30,713
Debt Service Coverage Ratio Range Three [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 186,373 | 69,451
Debt Service Coverage Ratio Range Three [Member] | LTV 0 to 59 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 43,486 | 3,801
Debt Service Coverage Ratio Range Three [Member] | LTV 60 To 69 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 62,617 | 43,921
Debt Service Coverage Ratio Range Three [Member] | LTV 70 To 79 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 76,054 | 15,367
Debt Service Coverage Ratio Range Three [Member] | LTV 80 to 100 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 4,216 | $ 6,362

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