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Fair Value Measurements (Changes in Fair Value of Securities Usin Level 3 Inputs) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning Balance $ 27,910,000 $ 5,187,000
Total net (losses) gains for the period included in OCI 1,089,000 [1] 507,000 [1]
Total net (losses) gains for the period included in net income 0 [2],[3] (960,000) [4],[5]
Purchases 12,911,000 0
Sales 0 0
Issuances 0 0
Settlements (3,742,000) (1,168,000)
Transfers into Level 3 12,642,000 24,344,000
Transfers out of Level 3 (8,533,000) 0
Fair Value, Ending Balance 42,277,000 27,910,000
Increase Decrease Of Receivable Related To Sale Of Subsidiary If Retention Assumption Were To Change 100,000  
Equity Securities [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning Balance 0  
Total net (losses) gains for the period included in OCI 0 [1]  
Total net (losses) gains for the period included in net income 0 [2],[3]  
Purchases 0  
Sales 0  
Issuances 0  
Settlements 0  
Transfers into Level 3 3,607,000  
Transfers out of Level 3 0  
Fair Value, Ending Balance 3,607,000  
AFS Fixed Maturity Securities [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value, Ending Balance 36,000,000  
AFS Fixed Maturity Securities [Member] | U.S. Government and Government Agencies [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning Balance 21,741,000 0
Total net (losses) gains for the period included in OCI (22,000) [1] 0 [1]
Total net (losses) gains for the period included in net income (193,000) [2],[3] 0 [4],[5]
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (1,737,000) 0
Transfers into Level 3 0 21,741,000
Transfers out of Level 3 0 0
Fair Value, Ending Balance 19,789,000 21,741,000
AFS Fixed Maturity Securities [Member] | Corporate Securities [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning Balance 2,603,000 0
Total net (losses) gains for the period included in OCI 185,000 [1] 0 [1]
Total net (losses) gains for the period included in net income 0 [2],[3] 0 [4],[5]
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (630,000) 0
Transfers into Level 3 788,000 2,603,000
Transfers out of Level 3 0 0
Fair Value, Ending Balance 2,946,000 2,603,000
AFS Fixed Maturity Securities [Member] | Asset-backed Securities [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning Balance 0  
Total net (losses) gains for the period included in OCI 68,000 [1]  
Total net (losses) gains for the period included in net income 0 [2],[3]  
Purchases 7,300,000  
Sales 0  
Issuances 0  
Settlements 0  
Transfers into Level 3 0  
Transfers out of Level 3 (1,300,000)  
Fair Value, Ending Balance 6,068,000  
AFS Fixed Maturity Securities [Member] | Commercial Mortgage-backed Securities (CMBS) [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning Balance 354,000 185,000
Total net (losses) gains for the period included in OCI 858,000 [1] 507,000 [1]
Total net (losses) gains for the period included in net income (51,000) [2],[3] (322,000) [4],[5]
Purchases 5,611,000 0
Sales 0 0
Issuances 0 0
Settlements (624,000) (16,000)
Transfers into Level 3 8,247,000 0
Transfers out of Level 3 (7,233,000) 0
Fair Value, Ending Balance 7,162,000 354,000
Receivable For Proceeds From Divestiture Of Businesses [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value, Beginning Balance 3,212,000 5,002,000
Total net (losses) gains for the period included in OCI 0 [1] 0 [1]
Total net (losses) gains for the period included in net income 244,000 [2],[3] (638,000) [4],[5]
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (751,000) (1,152,000)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Fair Value, Ending Balance 2,705,000 3,212,000
Fair Value, Inputs, Level 3 [Member] | AFS Fixed Maturity Securities [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Transfers into Level 3 $ 9,000,000  
[1] 1 Amounts are reported in “Unrealized holding gains arising during period” on the Consolidated Statements of Comprehensive Income.
[2] 2 Amounts are reported in “Net realized gains (losses)” for realized gains and losses and “Net investment income earned” for amortization of securities on the Consolidated Statements of Income.
[3] 3 Amounts are reported in “Other income” for the receivable related to the sale of Selective HR on the Consolidated Statements of Income, and are related to interest accretion on the receivable.
[4] 2 Amounts are reported in “Net realized gains (losses)” for realized gains and losses and “Net investment income earned” for amortization for the CMBS securities on the Consolidated Statements of Income.
[5] 3 Amounts are reported in either “Loss on disposal of discontinued operations, net of tax” or “Other income” for the receivable related to the sale of Selective HR on the Consolidated Statements of Income. Amounts in “Loss on disposal of discontinued operations, net of tax” related to charges to reduce the fair value of our receivable, and amounts in “Other income” related to interest accretion on the receivable.