Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details Textual)

v3.8.0.1
Commitments and Contingencies (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Operating Leases, Rent Expense $ 1,100 $ 3,200
Surety Bond [Member]    
Long-term Debt 98,800 98,800
Energy Contracts [Member]    
Other Commitment, Due in Next Twelve Months 84 84
Other Commitment, Due in Second Year $ 42 $ 42