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Summary of Significant Accounting Policies (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Premiums receivable from policyholders for final audit $ 19,600,000 $ 6,900,000    
Write-offs, net of recoveries of amounts previously written off 1,900,000 2,200,000 3,200,000  
Deferred policy acquisition cost, amortization expense 85,926,000 74,500,000 72,071,000  
Reinsurance quota share, percentage 100.00%      
Unpaid losses 805,386,000 940,840,000 956,043,000 1,052,505,000
LPT actual amounts paid versus expected amounts, period every five years      
LPT actual amounts paid versus expected amounts, expiration period first twenty-five years      
LPT favorable/ unfavorable difference, percentage 30.00%      
LPT - loss expense as a percentange of losses paid, for management of LPT claims 7.00%      
Direct written premiums were subject to dividends participation 2.80% 4.30% 5.20%  
Collateralized by cash or letter of credit 5,800,000      
LPT collateral held in trust account 1,029,100,000      
Intangible Assets, Net (Excluding Goodwill) [Abstract]        
Intangible assets, gross carrying amount 17,100,000 17,100,000    
Intangible assets, accumulated amortization (6,542,000) (5,372,000)    
Intangible assets, net 10,558,000 11,728,000    
Amortization of intangible assets 1,200,000 1,600,000 2,200,000  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]        
Future amortization expense, year one 873,000      
Future amortization expense, year two 651,000      
Future amortization expense, year three 489,000      
Future amortization expense, year four 371,000      
Future amortization expense, year five 285,000      
Future amortization expense, after year Five 189,000      
Intangible assets, future amortization total 2,858,000      
Licensing Agreements [Member]
       
Intangible Assets, Net (Excluding Goodwill) [Abstract]        
Intangible assets, gross carrying amount 7,700,000 7,700,000    
Intangible assets, net 7,700,000 7,700,000    
Service Agreements [Member]
       
Intangible Assets, Net (Excluding Goodwill) [Abstract]        
Intangible assets, gross carrying amount 9,400,000 9,400,000    
Intangible assets, accumulated amortization (6,542,000) (5,372,000)    
Intangible assets, net $ 2,858,000 $ 4,028,000    
Leasehold Improvements [Member]
       
Finite-Lived Intangible Assets, Amortization Method amortized over three to five years      
Electronic Data Processing Equipment, Software, Furniture and Equipment and Automobiles [Member]
       
Finite-Lived Intangible Assets, Amortization Method straight-line method over three to seven years