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5. Debt (Tables)
6 Months Ended
Jun. 30, 2016
Debt Disclosure [Abstract]  
Schedule of Long Term Debt
   June 30, 2016   December 31, 2015 
Kinergy operating line of credit  $62,045   $61,003 
Plant term debt   155,070    162,622 
    217,115    223,625 
Less unamortized discount   (1,688)   (2,299)
Less unamortized debt financing costs   (386)   (462)
Less short-term portion       (17,003)
Long-term debt  $215,041   $203,861