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Investments (Impaired Mortgage Loans) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Unpaid Principal Balance |  | $ 17,017 |  | $ 17,017 |  |  | $ 30,660
Recorded Investment |  | 17,016 |  | 17,016 |  |  | 30,635
Related Allowance |  | 0 |  | 0 |  |  | 0
Carrying Value |  | 17,016 |  | 17,016 |  |  | 30,635
Average Investment | [1] | 17,015 | $ 30,641 | 20,436 |  | $ 22,641 |
Interest Income |  | 170 | 346 | 669 |  | 650 |
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 |
Interest Income |  | 0 | 0 | 0 | [1] | 0 |
Impaired mortgage loans with no valuation allowance recorded |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |
Unpaid Principal Balance |  | 17,017 |  | 17,017 |  |  | 30,660
Recorded Investment |  | 17,016 |  | 17,016 |  |  | 30,635
Related Allowance |  | 0 |  | 0 |  |  | 0
Carrying Value |  | 17,016 |  | 17,016 |  |  | $ 30,635
Average Investment | [1] | 17,015 | 30,641 | 20,436 |  | 22,641 |
Interest Income |  | $ 170 | $ 346 | $ 669 |  | $ 650 |
[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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