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Significant Accounting Policies (Details Textual) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Significant Accounting Policies (Textual) [Abstract]        
Deferred policy acquisition costs $ 17,377,000 $ 11,798,000   $ 17,282,000
Significant Accounting Policies (Additional Textual) [Abstract]        
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    
Maximum amortization period for capitalized cost 12 months      
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