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Significant Accounting Policies (Details Textual) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Significant Accounting Policies (Textual) [Abstract]            
Deferred policy acquisition costs $ 51,872,000 $ 56,922,000 $ 50,200,000 $ 59,129,000 $ 51,860,000 $ 50,128,000
Significant Accounting Policies (Additional Textual) [Abstract]            
Excess amount of cash balance transferred into custodial accounts 250,000 250,000 250,000      
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% 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   $ 11,400,000 $ 13,000,000