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Debt (Details) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Debt    
Current portion of debt outstanding $ 1,383,000 $ 1,516,000
Non-Current portion of debt outstanding 197,917,000 196,545,000
Scheduled minimum debt repayments    
Remainder of 2012 1,300,000  
2013 1,500,000  
2014 1,500,000  
2015 1,400,000  
2016 230,600,000  
2017 300,000  
Convertible Notes 3.25%, net of discount, due June 2016
   
Debt    
Interest rate (as a percent) 3.25%  
Non-Current portion of debt outstanding 192,793,000 190,877,000
Bank loans 2.69% - 3.88% due February 2012 - September 2017
   
Debt    
Current portion of debt outstanding 1,383,000 1,516,000
Non-Current portion of debt outstanding $ 5,124,000 $ 5,668,000
Bank loans 2.69% - 3.88% due February 2012 - September 2017 | Minimum
   
Debt    
Interest rate (as a percent) 2.69%  
Bank loans 2.69% - 3.88% due February 2012 - September 2017 | Maximum
   
Debt    
Interest rate (as a percent) 3.88%