Quarterly report pursuant to Section 13 or 15(d)

Notes Payable (Details)

v3.10.0.1
Notes Payable (Details) - Sweetwater IDR Bond [Member]
$ in Thousands
9 Months Ended
Oct. 15, 2013
USD ($)
Sep. 30, 2018
USD ($)
Oct. 23, 2013
item
Notes Payable      
Proceeds from Issuance of Long-term Debt $ 34,000    
Periodic payment amount   $ 16,246  
Due Quarterly Commencing From January 1, 2014 [Member]      
Notes Payable      
Fixed interest rate (as a percent)     5.75%
Due Quarterly Commencing From January 1, 2015 [Member]      
Notes Payable      
Number of installments | item     28