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Investments (Impaired Mortgage Loans) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance | $ 38,470 |  | $ 40,566 |  |  |
Impaired Financing Receivable, Recorded Investment | 37,841 |  | 39,956 |  |  |
Impaired Financing Receivable, Related Allowance | 3,211 |  | 6,980 |  |  |
Impaired Financing Receivable Net Of Related Allowance | 34,630 |  | 32,976 |  |  |
Impaired Financing Receivable, Average Recorded Investment | 37,841 | [1] | 49,983 | [1] | 42,589 | [1]
Impaired Financing Receivable, Interest Income, Accrual Method | 1,803 |  | 1,669 |  | 1,048 |
Impaired mortgage loans with no valuation allowance recorded |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance | 21,698 |  | 13,039 |  |  |
Impaired Financing Receivable, Recorded Investment | 21,100 |  | 12,496 |  |  |
Impaired Financing Receivable, Related Allowance | 0 |  | 0 |  |  |
Impaired Financing Receivable Net Of Related Allowance | 21,100 |  | 12,496 |  |  |
Impaired Financing Receivable, Average Recorded Investment | 15,023 | [1] | 15,549 | [1] | 14,877 | [1]
Impaired Financing Receivable, Interest Income, Accrual Method | 852 |  | 1,244 |  | 630 |
Impaired mortgage loans with valuation allowance recorded |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance | 16,772 |  | 27,527 |  |  |
Impaired Financing Receivable, Recorded Investment | 16,741 |  | 27,460 |  |  |
Impaired Financing Receivable, Related Allowance | 3,211 |  | 6,980 |  |  |
Impaired Financing Receivable Net Of Related Allowance | 13,530 |  | 20,480 |  |  |
Impaired Financing Receivable, Average Recorded Investment | 22,818 | [1] | 34,434 | [1] | 27,712 | [1]
Impaired Financing Receivable, Interest Income, Accrual Method | $ 951 |  | $ 425 |  | $ 418 |
[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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