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Fair Value Measurements (Changes in Fair Value of Securities Using Level 3 Inputs) (Details) (USD $)
In Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Fair value, Beginning balance $ 5,187 $ 12,300
Total net gains (losses) for the period included in OCI 440 [1] 1,840 [1]
Total net gains (losses) for the period included in net income 20 [2] (5,419) [2],[3]
Purchases 0  
Sales 0  
Issuances 0  
Settlements (675)  
Purchases, sales, issuances, and settlements (net)   751
Net transfers in and/or out of Level 3 0 (4,285)
Fair value, Ending balance 4,972 5,187
Asset-backed Securities ("ABS") [Member] | AFS Fixed Maturity Securities [Member]
    
Fair value, Beginning balance   0
Total net gains (losses) for the period included in OCI   (22) [1]
Total net gains (losses) for the period included in net income   0 [2],[3]
Purchases, sales, issuances, and settlements (net)   2,737
Net transfers in and/or out of Level 3   (2,715)
Fair value, Ending balance   0
Commercial Mortgage-backed Securities ("CMBS") [Member] | AFS Fixed Maturity Securities [Member]
    
Fair value, Beginning balance 185 0
Total net gains (losses) for the period included in OCI 440 [1] 1,862 [1]
Total net gains (losses) for the period included in net income (179) [2] 41 [2],[3]
Purchases 0  
Sales 0  
Issuances 0  
Settlements (5)  
Purchases, sales, issuances, and settlements (net)   (148)
Net transfers in and/or out of Level 3 0 (1,570)
Fair value, Ending balance 441 185
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 199 [2] (5,460) [2],[3]
Purchases 0  
Sales 0  
Issuances 0  
Settlements (670)  
Purchases, sales, issuances, and settlements (net)   (1,838)
Net transfers in and/or out of Level 3 0 0
Fair value, Ending balance $ 4,531 $ 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 investment gains (losses)" for the ABS and CMBS securities and "Other income" for the receivable related to the sale of Selective HR on the Consolidated Statements of Income.
[3] Amounts are reported in "Loss on disposal of discontinued operations, net of tax" for the receivable related to sale of Selective HR on the Consolidated Statements of Income.