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Investments (Impaired Mortgage Loans) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Unpaid Principal Balance |  | $ 17,017 |  | $ 17,017 |  | $ 30,660
Recorded Investment |  | 17,014 |  | 17,014 |  | 30,635
Related Allowance |  | 0 |  | 0 |  | 0
Carrying Value |  | 17,014 |  | 17,014 |  | 30,635
Average Investment | [1] | 17,047 | $ 27,038 | 21,576 | $ 19,978 |
Interest Income |  | 171 | 247 | 499 | 304 |
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 | 0 |
Interest Income |  | 0 | 0 | 0 | 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 |  | 17,014 |  | 17,014 |  | 30,635
Related Allowance |  | 0 |  | 0 |  | 0
Carrying Value |  | 17,014 |  | 17,014 |  | $ 30,635
Average Investment | [1] | 17,047 | 27,038 | 21,576 | 19,978 |
Interest Income |  | $ 171 | $ 247 | $ 499 | $ 304 |
[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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