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Investments (Impaired Mortgage Loans) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Unpaid Principal Balance |  | $ 6,427 |  | $ 6,427 |  | $ 2,758
Recorded Investment |  | 5,856 |  | 5,856 |  | 2,216
Related Allowance |  | 0 |  | 0 |  | 0
Carrying Value |  | 5,856 |  | 5,856 |  | 2,216
Average Investment | [1] | 3,967 | $ 6,953 | 3,062 | $ 10,146 |
Interest Income |  | 33 | 107 | 100 | 324 |
Impaired mortgage loans with valuation allowance recorded |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Unpaid Principal Balance |  | 0 |  | 0 |  | 0
Recorded Investment |  | 0 |  | 0 |  | 0
Related Allowance |  | 0 |  | 0 |  | 0
Carrying Value |  | 0 |  | 0 |  | 0
Average Investment | [1] | 0 | 0 | 0 | 5,459 |
Interest Income |  | 0 | 0 | 0 | 0 |
Impaired mortgage loans with no valuation allowance recorded |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Unpaid Principal Balance |  | 6,427 |  | 6,427 |  | 2,758
Recorded Investment |  | 5,856 |  | 5,856 |  | 2,216
Related Allowance |  | 0 |  | 0 |  | 0
Carrying Value |  | 5,856 |  | 5,856 |  | $ 2,216
Average Investment | [1] | 3,967 | 6,953 | 3,062 | 4,687 |
Interest Income |  | $ 33 | $ 107 | $ 100 | $ 324 |
[1] | Average recorded investment represents the average loan balances as of the beginning of period and all subsequent quarterly end of period balances.

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