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Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2012
Financial Instruments Disclosure [Abstract]  
Financial Instruments Disclosure [Table Text Block]
  December 31, 2012 December 31, 2011  
  Fair Value Carrying Value Fair Value Carrying Value
Assets:        
Derivative instruments$ -$ -$ 1,247$ 1,247
         
Liabilities:        
Debt  869,488  859,506  419,847  467,378
Derivative instruments  7,402  7,402  16,067  16,067