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Investments (Impaired Mortgage Loans) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |  |
Unpaid Principal Balance | $ 20,079 |  |  |  | $ 20,079 |  |  |  | $ 38,470
Recorded Investment | 19,514 |  |  |  | 19,514 |  |  |  | 37,841
Related Allowance | 786 |  |  |  | 786 |  |  |  | 3,211
Carrying Value | 18,728 |  |  |  | 18,728 |  |  |  | 34,630
Average Investment | 24,029 | [1] | 35,121 | [1] | 29,561 | [1] | 37,841 | [1] |
Interest Income | 251 |  | 615 |  | 1,092 |  | 1,334 |  |
Impaired mortgage loans with valuation allowance recorded |  |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |  |
Unpaid Principal Balance | 10,329 |  |  |  | 10,329 |  |  |  | 16,772
Recorded Investment | 10,366 |  |  |  | 10,366 |  |  |  | 16,741
Related Allowance | 786 |  |  |  | 786 |  |  |  | 3,211
Carrying Value | 9,580 |  |  |  | 9,580 |  |  |  | 13,530
Average Investment | 14,870 | [1] | 21,490 | [1] | 14,705 | [1] | 24,337 | [1] |
Interest Income | 26 |  | 266 |  | 478 |  | 801 |  |
Impaired mortgage loans with no valuation allowance recorded |  |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |  |
Unpaid Principal Balance | 9,750 |  |  |  | 9,750 |  |  |  | 21,698
Recorded Investment | 9,148 |  |  |  | 9,148 |  |  |  | 21,100
Related Allowance | 0 |  |  |  | 0 |  |  |  | 0
Carrying Value | 9,148 |  |  |  | 9,148 |  |  |  | 21,100
Average Investment | 9,159 | [1] | 13,631 | [1] | 14,856 | [1] | 13,504 | [1] |
Interest Income | $ 225 |  | $ 349 |  | $ 614 |  | $ 533 |  |
[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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