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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
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.