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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
Dec. 31, 2011
years
Dec. 31, 2010
Fair value, Beginning balance $ 5,187 $ 12,300
Total net gains (losses) for the period included in OCI 507 [1] 1,840 [1]
Total net gains (losses) for the period included in net income (960) [2],[3] (5,419) [2],[3]
Purchases 0  
Sales 0  
Issuances 0  
Settlements (1,168)  
Purchases, sales, issuances, and settlements (net)   751
Net transfers in and/or out of Level 3 24,344 (4,285)
Fair value, Ending balance 27,910 5,187
Period over which proceeds are scheduled to be received 10  
AFS Fixed Maturity Securities [Member] | Corporate Securities [Member]
    
Fair value, Beginning balance 0  
Total net gains (losses) for the period included in OCI 0 [1]  
Total net gains (losses) for the period included in net income 0 [2],[3]  
Purchases 0  
Sales 0  
Issuances 0  
Settlements 0  
Net transfers in and/or out of Level 3 2,603  
Fair value, Ending balance 2,603  
AFS Fixed Maturity Securities [Member] | U.S. Government and Government Agencies [Member]
    
Fair value, Beginning balance 0  
Total net gains (losses) for the period included in OCI 0 [1]  
Total net gains (losses) for the period included in net income 0 [2],[3]  
Purchases 0  
Sales 0  
Issuances 0  
Settlements 0  
Net transfers in and/or out of Level 3 21,741  
Fair value, Ending balance 21,741  
AFS Fixed Maturity Securities [Member] | Asset-backed Securities ("ABS") [Member]
    
Fair value, Beginning balance   0
Total net gains (losses) for the period included in OCI   (22) [1]
Purchases, sales, issuances, and settlements (net)   2,737
Net transfers in and/or out of Level 3   (2,715)
Fair value, Ending balance   0
AFS Fixed Maturity Securities [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member]
    
Fair value, Beginning balance 185 0
Total net gains (losses) for the period included in OCI 507 [1] 1,862 [1]
Total net gains (losses) for the period included in net income (322) [2],[3] 41 [2],[3]
Purchases 0  
Sales 0  
Issuances 0  
Settlements (16)  
Purchases, sales, issuances, and settlements (net)   (148)
Net transfers in and/or out of Level 3 0 (1,570)
Fair value, Ending balance 354 185
Receivable For Proceeds From Divestiture Of Businesses [Member]
    
Fair value, Beginning balance 5,002 12,300
Total net gains (losses) for the period included in OCI 0 [1] 0 [1]
Total net gains (losses) for the period included in net income (638) [2],[3] (5,460) [2],[3]
Purchases 0  
Sales 0  
Issuances 0  
Settlements (1,152)  
Purchases, sales, issuances, and settlements (net)   (1,838)
Net transfers in and/or out of Level 3 0 0
Fair value, Ending balance $ 3,212 $ 5,002
[1] Amounts are reported in "Other net unrealized gains on investment securities, net of deferred income tax" on the Consolidated Statements of Stockholders' Equity.
[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.
[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" relate to charges to reduce the fair value of our receivable and amounts in "Other income" related to interest accretion on the receivable.