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Investments (Impaired Mortgage Loans) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |  |
Unpaid Principal Balance | $ 33,298 |  |  |  | $ 33,298 |  |  |  | $ 40,566
Recorded Investment | 32,624 |  |  |  | 32,624 |  |  |  | 39,956
Related Allowance | 4,691 |  |  |  | 4,691 |  |  |  | 6,980
Carrying Value | 27,933 |  |  |  | 27,933 |  |  |  | 32,976
Average Investment | 35,121 | [1] | 46,101 | [1] | 37,841 | [1] | 52,490 | [1] |
Interest Income | 615 |  | 570 |  | 1,334 |  | 1,485 |  |
Impaired mortgage loans with valuation allowance recorded |  |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |  |
Unpaid Principal Balance | 21,536 |  |  |  | 21,536 |  |  |  | 27,527
Recorded Investment | 21,467 |  |  |  | 21,467 |  |  |  | 27,460
Related Allowance | 4,691 |  |  |  | 4,691 |  |  |  | 6,980
Carrying Value | 16,776 |  |  |  | 16,776 |  |  |  | 20,480
Average Investment | 21,490 | [1] | 35,047 | [1] | 24,337 | [1] | 36,178 | [1] |
Interest Income | 266 |  | 461 |  | 801 |  | 1,180 |  |
Impaired mortgage loans with no valuation allowance recorded |  |  |  |  |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |  |  |  |  |
Unpaid Principal Balance | 11,762 |  |  |  | 11,762 |  |  |  | 13,039
Recorded Investment | 11,157 |  |  |  | 11,157 |  |  |  | 12,496
Related Allowance | 0 |  |  |  | 0 |  |  |  | 0
Carrying Value | 11,157 |  |  |  | 11,157 |  |  |  | 12,496
Average Investment | 13,631 | [1] | 11,054 | [1] | 13,504 | [1] | 16,312 | [1] |
Interest Income | $ 349 |  | $ 109 |  | $ 533 |  | $ 305 |  |
[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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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5258-111524 + Details
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