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Significant Accounting Policies (Details Textual) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2012
Jun. 30, 2012
Sep. 30, 2011
Jun. 30, 2011
Dec. 31, 2010
Significant Accounting Policies (Textual) [Abstract]              
Deferred policy acquisition costs   $ 11,355,000 $ 18,019,000 $ 17,744,000 $ 13,013,000 $ 12,026,000 $ 9,446,000
Significant Accounting Policies (Additional Textual) [Abstract]              
Unsecured amounts due from reinsurers exceeding a fixed percentage of stockholders equity   3.00% 3.00%        
Percentage reduction in net, deferred policy acquisition costs   13.00%          
Deferred policy acquisition costs net difference amount 1,600,000            
Acquisition-related Costs [Member]
              
Significant Accounting Policies (Textual) [Abstract]              
Deferred policy acquisition costs   $ 13,000,000 $ 11,400,000