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Investments (Mortgage Loans by Credit Quality Indicator) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 4,572,563 | $ 4,413,171
Loans Receivable, Gross, Commercial, Construction | $ 17,602 | $ 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 | $ 2,264,623 | $ 2,206,208
Loans Receivable, Gross, Commercial, Construction | $ 17,602 | $ 0
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 49.50% | 50.00%
LTV 60 To 69 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 1,719,540 | $ 1,608,078
Loans Receivable, Gross, Commercial, Construction | $ 0 | $ 0
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 37.60% | 36.40%
LTV 70 To 79 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 441,608 | $ 431,274
Loans Receivable, Gross, Commercial, Construction | $ 0 | $ 0
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 9.70% | 9.80%
LTV 80 to 100 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 146,792 | $ 167,611
Loans Receivable, Gross, Commercial, Construction | $ 0 | $ 9,686
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 3.20% | 3.80%
Debt Service Coverage Ratio Range One [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 4,095,040 | $ 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 | 2,125,328 | 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 | 1,552,568 | 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 | 315,274 | 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 | 101,870 | 120,850
Debt Service Coverage Ratio Range Two [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 258,059 | 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 | 102,254 | 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 | 117,751 | 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 | 25,121 | 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 | 12,933 | 30,713
Debt Service Coverage Ratio Range Three [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 201,862 | 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 | 19,439 | 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 | 49,221 | 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 | 101,213 | 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 | $ 31,989 | $ 6,362

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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