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Investments (Impaired Mortgage Loans) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  | $ 2,758 | $ 16,931 |
Impaired Financing Receivable, Recorded Investment |  | 2,216 | 16,421 |
Impaired Financing Receivable, Related Allowance |  | 0 | 588 |
Impaired Financing Receivable Net Of Related Allowance |  | 2,216 | 15,833 |
Impaired Financing Receivable, Average Recorded Investment | [1] | 2,249 | 17,625 | $ 27,054
Impaired Financing Receivable, Interest Income, Accrual Method |  | 142 | 1,100 | 1,284
Impaired mortgage loans with no valuation allowance recorded |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  | 2,758 | 4,033 |
Impaired Financing Receivable, Recorded Investment |  | 2,216 | 4,033 |
Impaired Financing Receivable, Related Allowance |  | 0 | 0 |
Impaired Financing Receivable Net Of Related Allowance |  | 2,216 | 4,033 |
Impaired Financing Receivable, Average Recorded Investment | [1] | 2,249 | 6,033 | 13,227
Impaired Financing Receivable, Interest Income, Accrual Method |  | 142 | 330 | 647
Impaired mortgage loans with valuation allowance recorded |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  | 0 | 12,898 |
Impaired Financing Receivable, Recorded Investment |  | 0 | 12,388 |
Impaired Financing Receivable, Related Allowance |  | 0 | 588 |
Impaired Financing Receivable Net Of Related Allowance |  | 0 | 11,800 |
Impaired Financing Receivable, Average Recorded Investment | [1] | 0 | 11,592 | 13,827
Impaired Financing Receivable, Interest Income, Accrual Method |  | $ 0 | $ 770 | $ 637
[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=66008989&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=66008989&loc=d3e5258-111524 + Details
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