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Investments (Details Textual) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Security
Jun. 30, 2011
Jun. 30, 2012
Security
Jun. 30, 2011
Dec. 31, 2011
Investments [Line Items]          
12 Months or Longer, Gross Unrealized Loss $ 94,919   $ 94,919   $ 114,011
Investments (Textual) [Abstract]          
Unrealized losses of one security under closed-block life insurance issuance 5,120   5,120    
Unrealized losses of one security of large diversified financial services company 4,554   4,554    
Period of unrealized loss position on large diversified financial services company     60 months    
Unrealized loss position of Alt-A securities greater than twelve months 31,293   31,293    
Period of unrealized loss position on Alt-A securities     54 months    
Percentage of unrealized losses on mortgage-backed securities attributable to Alt-A Securities 96.10%   96.10%    
Number of individual Alt-A securities 16   16    
Unrealized losses on security secured by IRS facility lease payments 31,222   31,222    
Period of unrealized loss position on security secured by IRS facility lease payments     54 months    
Impairment charges to earnings 2,328 17,578 5,399 19,291  
Securities fair value 7,083   7,083   7,132
Securities fair value 193,346   193,346   172,880
Percentage of future claim payments made in cash     25.00%    
Percentage of future claim payments made in surplus note     75.00%    
Percentage of permitted policy claim     25.00%    
Minimum [Member]
          
Investments [Line Items]          
Period of unrealized loss position on closed-block life insurance Issuance     36 months    
Maximum [Member]
          
Investments [Line Items]          
Period of unrealized loss position on closed-block life insurance Issuance     54 months    
Below Investment Grade Securities and Non Rated Securities [Member]
          
Investments [Line Items]          
Fair value of below investment grade securities and non-rated securities 267,213   267,213   268,633
Gross Unrealized loss 62,018   62,018   77,947
Other asset-backed securities [Member]
          
Investments [Line Items]          
12 Months or Longer, Gross Unrealized Loss 48,613   48,613    
Residential Mortgage-backed Securities [Member]
          
Investments [Line Items]          
12 Months or Longer, Gross Unrealized Loss 32,568   32,568   43,321
Corporate obligations [Member]
          
Investments [Line Items]          
12 Months or Longer, Gross Unrealized Loss $ 12,647   $ 12,647   $ 16,983