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Collateral Finance and Securitization Notes (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2006
Collateral Finance Facility [Line Items] |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 850,000,000.0
Direct investment in subsidiary |  |  |  | $ 112,800,000
Assets Held-in-trust | $ 767,900,000 | $ 841,500,000 |  |
Amount Held In Debt Service Coverage Account | 57,100,000 | 39,700,000 |  |
Collateral Financing Expense | 29,699,000 | 28,636,000 | $ 25,827,000 |
Debt Issuance Cost | 18,651,000 | 20,405,000 |  |
Reinsurance Group Of America Barbados [Member] |  |  |  |
Collateral Finance Facility [Line Items] |  |  |  |
Collateral Financing Expense | $ 5,100,000 | 4,200,000 | 4,000,000 |
Timerberlake Financial [Member] |  |  |  |
Collateral Finance Facility [Line Items] |  |  |  |
Debt Instrument, Issuance Date | Jun. 01, 2006 |  |  |
Collateral Financing Expense | $ 9,400,000 | 6,400,000 | 4,200,000 |
Chesterfield Financial Holdings LLC [Member] |  |  |  |
Collateral Finance Facility [Line Items] |  |  |  |
Debt Instrument, Face Amount | 300,000,000.0 |  |  |
Assets Held-in-trust | 13,500,000 | 19,400,000 |  |
Collateral Financing Expense | $ 9,500,000 | $ 11,300,000 | $ 13,100,000 |
Debt Instrument, Interest Rate, Stated Percentage | 4.50% |  |  |
Minimum [Member] |  |  |  |
Collateral Finance Facility [Line Items] |  |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | $ 35,000,000 |  |  |

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- Definition The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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