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Investments (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Available-for-sale securities:    
Cost and Amortized Cost $ 141,311 $ 151,979
Gross Unrealized Holding Gains 12,441 12,287
Gross Unrealized Holding Losses (2) (443)
Fair Value 153,750 163,823
Other investments:    
Cost and Amortized Cost 52,083 50,709
Gross Unrealized Holding Gains 9,985 9,721
Gross Unrealized Holding Losses   (53)
Fair Value 62,068 60,377
Investments    
Cost and Amortized Cost 193,394 202,688
Gross Unrealized Holding Gains 22,426 22,008
Gross Unrealized Holding Losses (2) (496)
Fair Value 215,818 224,200
Available-for-sale securities:    
Estimated Fair Value, Less than 12 Months   15,912
Gross Unrealized Losses, Less than 12 Months   (443)
Estimated Fair Value, Total   15,912
Gross Unrealized Losses, Total   (443)
Total investments    
Estimated Fair Value, Less than 12 Months   54,500
Gross Unrealized Losses, Less than 12 Months   (496)
Estimated Fair Value, Total   54,500
Gross Unrealized Losses, Total   (496)
Fixed maturities:
   
Available-for-sale securities:    
Cost and Amortized Cost 122,233 135,166
Gross Unrealized Holding Gains 10,259 9,825
Gross Unrealized Holding Losses (2) (190)
Fair Value 132,490 144,801
Available-for-sale securities:    
Estimated Fair Value, Less than 12 Months 558 7,436
Gross Unrealized Losses, Less than 12 Months (1) (190)
Estimated Fair Value, 12 Months or More 1,750  
Gross Unrealized Losses, 12 Months or More (1)  
Estimated Fair Value, Total 2,308 7,436
Gross Unrealized Losses, Total (2) (190)
Government securities
   
Available-for-sale securities:    
Cost and Amortized Cost 25,454 27,729
Gross Unrealized Holding Gains 1,210 1,439
Gross Unrealized Holding Losses (1) (3)
Fair Value 26,663 29,165
Available-for-sale securities:    
Estimated Fair Value, Less than 12 Months 399 1,695
Gross Unrealized Losses, Less than 12 Months (1) (3)
Estimated Fair Value, Total 399 1,695
Gross Unrealized Losses, Total (1) (3)
Residential mortgage-backed securities
   
Available-for-sale securities:    
Cost and Amortized Cost 9,678 11,708
Gross Unrealized Holding Gains 756 944
Fair Value 10,434 12,652
Commercial mortgage-backed securities
   
Available-for-sale securities:    
Cost and Amortized Cost 1,203 2,277
Gross Unrealized Holding Gains 65 36
Gross Unrealized Holding Losses   (10)
Fair Value 1,268 2,303
Available-for-sale securities:    
Estimated Fair Value, Less than 12 Months 159 487
Gross Unrealized Losses, Less than 12 Months   (10)
Estimated Fair Value, Total 159 487
Gross Unrealized Losses, Total   (10)
Corporate debt securities
   
Available-for-sale securities:    
Cost and Amortized Cost 85,898 93,452
Gross Unrealized Holding Gains 8,228 7,406
Gross Unrealized Holding Losses (1) (177)
Fair Value 94,125 100,681
Available-for-sale securities:    
Estimated Fair Value, Less than 12 Months   5,254
Gross Unrealized Losses, Less than 12 Months   (177)
Estimated Fair Value, 12 Months or More 1,750  
Gross Unrealized Losses, 12 Months or More (1)  
Estimated Fair Value, Total 1,750 5,254
Gross Unrealized Losses, Total (1) (177)
Equity securities
   
Available-for-sale securities:    
Cost and Amortized Cost 19,078 16,813
Gross Unrealized Holding Gains 2,182 2,462
Gross Unrealized Holding Losses   (253)
Fair Value 21,260 19,022
Available-for-sale securities:    
Estimated Fair Value, Less than 12 Months   8,476
Gross Unrealized Losses, Less than 12 Months   (253)
Estimated Fair Value, Total   8,476
Gross Unrealized Losses, Total   (253)
Note receivable
   
Other investments:    
Cost and Amortized Cost 40,015 38,641
Gross Unrealized Holding Gains 4,055  
Gross Unrealized Holding Losses   (53)
Fair Value 44,070 38,588
Other investments    
Estimated Fair Value, Less than 12 Months   38,588
Gross Unrealized Losses, Less than 12 Months   (53)
Estimated Fair Value, Total   38,588
Gross Unrealized Losses, Total   (53)
Warrants
   
Other investments:    
Cost and Amortized Cost 12,068 12,068
Gross Unrealized Holding Gains 5,930 9,721
Fair Value $ 17,998 $ 21,789