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Debt (Details Narrative) - USD ($)
$ in Thousands
9 Months Ended
Jan. 23, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Debt face amount   $ 235,533   $ 224,041
Senior unsecured notes $ 210,000 210,000   210,000
Debt instrument, term 5 years      
Unsecured notes coupon rate 8.20%      
Proceeds to repay outstanding indebtedness $ 179,000      
Repayment of debt $ 59,444 5,288 $ 205,615  
Capital lease obligations minimum lease payments   $ 417    
Loan maturity period   Few weeks to 11 years    
Debt, weighted average interest rate   7.60%    
Property, Plant and Equipment [Member]        
Debt instrument, collateral amount   $ 5,118   $ 4,758