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Fair Value Measurements (Changes in Fair Value of Securities Using Level 3 Inputs) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2013 Equity Securities [Member] | Dec. 31, 2013 Receivable For Proceeds From Divestiture Of Business [Member] | Sep. 30, 2014 Fixed Income Securities [Member] | Dec. 31, 2013 Fixed Income Securities [Member] | Dec. 31, 2013 Fixed Income Securities [Member] U.S. Government and Government Agencies [Member] | Dec. 31, 2013 Fixed Income Securities [Member] Corporate Securities [Member] | Dec. 31, 2013 Fixed Income Securities [Member] Asset-Backed Securities [Member] | Dec. 31, 2013 Fixed Income Securities [Member] Commercial Mortgage Backed Securities [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] AFS Fixed Income Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value, Beginning balance | $ 42,277 |  | $ 3,607 |  | $ 2,705 |  | $ 0 | $ 0 | $ 19,789 |  | $ 2,946 |  | $ 6,068 |  | $ 7,162 |  |
Total net (losses) gains for the period included in OCI | 4,089 | [1] | 3,935 | [1] | 0 | [1] |  |  | (537) | [1] | (7) | [1] | (74) | [1] | 772 | [1] |
Total net (losses) gains for the period included in net income | (1,195) | [2],[3] | 0 | [2],[3] | (1,480) | [2],[3] |  |  | (76) | [2],[3] | 0 | [2],[3] | 0 | [2],[3] | 361 | [2],[3] |
Purchases | 0 |  | 0 |  | 0 |  |  |  | 0 |  | 0 |  | 0 |  | 0 |  |
Sales | 0 |  | 0 |  | 0 |  |  |  | 0 |  | 0 |  | 0 |  | 0 |  |
Issuances | 0 |  | 0 |  | 0 |  |  |  | 0 |  | 0 |  | 0 |  | 0 |  |
Settlements | (4,660) |  | 0 |  | (225) |  |  |  | (1,847) |  | (168) |  | 0 |  | (2,420) |  |
Transfers into Level 3 | 0 |  | 0 |  | 0 |  |  |  | 0 |  | 0 |  | 0 |  | 0 |  |
Transfers out of Level 3 | (37,611) |  | (4,642) |  | (1,000) |  |  |  | (17,329) |  | (2,771) |  | (5,994) |  | (5,875) |  | (32,000)
Fair value, Ending balance | $ 2,900 |  | $ 2,900 |  | $ 0 |  | $ 0 | $ 0 | $ 0 |  | $ 0 |  | $ 0 |  | $ 0 |  |
[1] | Amounts are reported in “Unrealized holding (losses) gains arising during period” on the Consolidated Statements of Comprehensive Income in our 2013 Annual Report.
[2] | For the receivable related to the sale of Selective HR, amounts in "Loss on disposal of discontinued operations, net of tax" relate to an impairment charge and amounts in "Other income" relate to interest accretion on the Consolidated Statements of Income in our 2013 Annual Report.
[3] | Amounts are reported in “Net realized gains” for realized gains and losses and “Net investment income earned” for amortization of securities on the Consolidated Statements of Income in our 2013 Annual Report.

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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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