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Long-term debt (Tables)
3 Months Ended
Mar. 31, 2013
Debt Disclosure [Abstract]  
Schedule of Long-Term Debt
(expressed in thousands of dollars)                   

Issued

   Maturity Date      March 31, 2013    December 31, 2012  

Senior Secured Notes

     4/15/2018       $195,000    $ 195,000