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Investments (Impaired Mortgage Loans) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Unpaid Principal Balance |  | $ 17,453 |  | $ 17,453 |  | $ 17,593
Recorded Investment |  | 16,885 |  | 16,885 |  | 17,027
Related Allowance |  | 671 |  | 671 |  | 816
Carrying Value |  | 16,214 |  | 16,214 |  | 16,211
Average Investment | [1] | 16,921 | $ 30,444 | 16,956 | $ 32,910 |
Interest Income |  | 264 | 330 | 525 | 841 |
Impaired mortgage loans with valuation allowance recorded |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Unpaid Principal Balance |  | 13,039 |  | 13,039 |  | 10,279
Recorded Investment |  | 12,531 |  | 12,531 |  | 10,316
Related Allowance |  | 671 |  | 671 |  | 816
Carrying Value |  | 11,860 |  | 11,860 |  | 9,500
Average Investment | [1] | 11,397 | 15,855 | 11,036 | 16,151 |
Interest Income |  | 229 | 259 | 384 | 452 |
Impaired mortgage loans with no valuation allowance recorded |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |
Unpaid Principal Balance |  | 4,414 |  | 4,414 |  | 7,314
Recorded Investment |  | 4,354 |  | 4,354 |  | 6,711
Related Allowance |  | 0 |  | 0 |  | 0
Carrying Value |  | 4,354 |  | 4,354 |  | $ 6,711
Average Investment | [1] | 5,524 | 14,589 | 5,920 | 16,759 |
Interest Income |  | $ 35 | $ 71 | $ 141 | $ 389 |
[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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