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Investments (Mortgage Loans by Maturity Date) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 4,794,226 | $ 4,413,171
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 100.00% | 100.00%
Due within five years |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 1,216,241 | $ 1,091,066
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 25.40% | 24.80%
Due after five years through ten years |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 2,738,400 | $ 2,516,872
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 57.10% | 57.00%
Due after ten years |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 839,585 | $ 805,233
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 17.50% | 18.20%

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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 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://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)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: 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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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