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Stockholders' Equity (Details Textual) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stockholders' Equity (Textual) [Abstract]              
Number of convertible preferred stock         0 0  
Preferred stock conversion factor           5.00  
Stockholders' Equity (Additional Textual) [Abstract]              
Wrong conversion factor             1.25
Preferred stock conversion             1,188,000
Additional issuance of shares to correct adjustment factor           3,562  
Dividend payment restrictions 100.00%       100.00%    
Received distributions from the earnings of subsidiaries         $ 40,200,000 $ 89,300,000 $ 30,500,000
Capital contributions to subsidiaries         28,600,000 49,000,000 30,000,000
Series A [Member]
              
Stockholders' Equity (Textual) [Abstract]              
Series A preferred stock pays a cumulative dividend $ 0.25 $ 0.25 $ 0.25 $ 0.25      
Preferred stock aggregate dividends         20,000 20,000 20,000
Preferred stock conversion factor 2.50       2.50 2.50  
Series M [Member]
              
Stockholders' Equity (Textual) [Abstract]              
Preferred stock aggregate dividends         $ 267,000    
Number of convertible preferred stock             950
Preferred stock conversion factor 5.00       5.00 5.00