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Investments (Impaired Mortgage Loans) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Unpaid Principal Balance |  | $ 7,495 |  | $ 7,495 |  | $ 16,931
Recorded Investment |  | 6,993 |  | 6,993 |  | 16,421
Related Allowance |  | 0 |  | 0 |  | 588
Carrying Value |  | 6,993 |  | 6,993 |  | 15,833
Average Investment | [1] | 8,625 | $ 16,921 | 11,224 | $ 16,956 |
Interest Income |  | 107 | 264 | 216 | 525 |
Impaired mortgage loans with valuation allowance recorded |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Unpaid Principal Balance |  | 0 |  | 0 |  | 12,898
Recorded Investment |  | 0 |  | 0 |  | 12,388
Related Allowance |  | 0 |  | 0 |  | 588
Carrying Value |  | 0 |  | 0 |  | 11,800
Average Investment | [1] | 4,724 | 11,397 | 7,279 | 11,036 |
Interest Income |  | 0 | 229 | 0 | 384 |
Impaired mortgage loans with no valuation allowance recorded |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Unpaid Principal Balance |  | 7,495 |  | 7,495 |  | 4,033
Recorded Investment |  | 6,993 |  | 6,993 |  | 4,033
Related Allowance |  | 0 |  | 0 |  | 0
Carrying Value |  | 6,993 |  | 6,993 |  | $ 4,033
Average Investment | [1] | 3,901 | 5,524 | 3,945 | 5,920 |
Interest Income |  | $ 107 | $ 35 | $ 216 | $ 141 |
[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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