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Shareholders' Equity - Share Capital Transactions (Details) (USD $)
 0 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Dec. 23, 2009
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Sep. 28, 2011
Common Stock [Member]
Dec. 23, 2009
Common Stock [Member]
Aug. 31, 2011
Common Stock [Member]
Dec. 23, 2009
Series B Preferred Stock [Member]
Jun. 30, 2010
Series B Preferred Stock [Member]
Aug. 31, 2011
Nonvoting Common Stock [Member]
Jun. 30, 2010
Nonvoting Common Stock [Member]
Aug. 18, 2011
Series C Preferred Stock [Member]
Dec. 31, 2012
Series C Preferred Stock [Member]
Aug. 18, 2011
Series A Preferred Stock [Member]
Dec. 23, 2009
First Six Months [Member]
Series B Preferred Stock [Member]
Dec. 23, 2009
Second Six Month Period [Member]
Series B Preferred Stock [Member]
Class of Stock [Line Items]                                
Shares issued during the period           1,264,952   1,359       7,000        
Shares issued, price per share           $ 5.25   $ 1,000                
Shares issued during the period, value $ 8,000,000   $ 7,000,000                 $ 7,000,000        
Issuance costs 242,000                              
Preferred stock dividend rate, percentage               20.00%         5.00%   10.00% 15.00%
Conversion of preferred stock Series B, non-voting, shares             258,862       258,862          
Shares redeemed or converted in the period                 1,359 258,862       7,000    
Redemption or conversion of preferred stock     7,000,000                     7,000,000    
Number of shares called by warrant         79,037                      
Repurchase of common stock warrant   $ 0 $ 185,000 $ 0 $ 185,000