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Significant Accounting Policies (Details Textual) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Significant Accounting Policies (Textual) [Abstract]          
Deferred policy acquisition costs   $ 17,282,000 $ 12,996,000 $ 9,445,000 $ 9,464,000
Significant Accounting Policies (Additional Textual) [Abstract]          
Maximum maturity period of highly liquid investments   3 months      
Allowances for doubtful accounts   530,000 715,000    
Accruals for premium deficiency   0 0    
Risk of loss from bank failures by minimizing amounts held in excess of depository accounts   250,000      
Unsecured amounts due from reinsurers exceeding a fixed percentage of stockholders equity   3.00%      
Deferred policy acquisition costs, net, difference percentage     13.00%    
Deferred policy acquisition costs, pre-tax charge against earnings 1,600,000        
Minimum [Member]
          
Significant Accounting Policies (Textual) [Abstract]          
Useful life of property and equipment   3 years      
Number of installments to pay policy premiums   2      
Maximum [Member]
          
Significant Accounting Policies (Textual) [Abstract]          
Useful life of property and equipment   27 years 6 months      
Number of installments to pay policy premiums   4      
Acquisition-related costs [Member] | Minimum [Member]
          
Significant Accounting Policies (Textual) [Abstract]          
Deferred policy acquisition costs     11,400,000    
Acquisition-related costs [Member] | Maximum [Member]
          
Significant Accounting Policies (Textual) [Abstract]          
Deferred policy acquisition costs     $ 13,000,000