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Debt - Plains Credit Facility (Details) - Plains Credit Facility - USD ($)
Feb. 29, 2016
Dec. 22, 2016
Long-term debt    
Line of credit limit $ 50,000,000  
Period during which the debt instrument principal balance is required to be paid following its issuance 1 year  
Long-term Line of Credit   $ 23,500,000
Interest rate 2.70%  
LIBOR    
Long-term debt    
Percentage of margin added to reference rate to determine interest rate on debt 2.30%