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Investment in Term Loans (Details) (USD $)
 1 Months Ended 12 Months Ended
Jul. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Feb. 28, 2011
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Accounts receivable, including non-trade of $38,120 (2010 - $35,960) and related party balance of $3,487 (2010 - $nil)   $ 353,659,000 $ 256,496,000  
Investment In Term Loans (Textual) [Abstract]        
Principal amount outstanding of term loan 115,000,000      
Total amount of the term loan including costs of acquisition 115,600,000      
Interest rate on term loan   9.00% 9.00%  
Investment yield     10.00%  
Repayment premium on loan outstanding     3.00%  
Repayment premium included in principal balance   1,500,000 500,000  
Term Loan       70,000,000
Investment in term loans (note 4)   186,844,000 116,014,000  
Loan [Member]
        
Schedule of Investment Income, Reported Amounts, by Category [Line Items]        
Accounts receivable, including non-trade of $38,120 (2010 - $35,960) and related party balance of $3,487 (2010 - $nil)   $ 2,800,000 $ 1,800,000