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Long term debt, current and non-current (Tables)
 6 Months Ended
Jun. 30, 2013
Debt Instruments [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
  June 30, 2013 December 31, 2012
Royal Bank of Scotland - Revolving credit facility$ 92,700$ 92,700
Less related deferred financing costs   (697)  (794)
Total $ 92,003$ 91,906