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Commitments and Contingencies - Contractual Obligations (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Jun. 30, 2016
Capital Lease Obligations    
2017 $ 702  
2018 861  
2019 107  
2020 51  
2021 4  
Thereafter 0  
Total minimum lease payments 1,725  
Less: imputed interest (0.82% to 10.7%) (62)  
Present value of future minimum lease payments 1,663  
Less: current portion 1,214 $ 1,323
Other long-term liabilities-capital leases 449 $ 1,036
Operating Lease Obligations    
2017 2,112  
2018 4,067  
2019 3,158  
2020 1,617  
2021 642  
Thereafter 186  
Future Minimum Payments Due 11,782  
Purchase Commitments    
2017 68,777  
2018 20,215  
2019 0  
2020 0  
2021 0  
Thereafter 0  
Future minimum purchase commitments 88,992  
Pension Plan [Member]    
Defined Benefit Plan Obligations    
2017 3,947  
2018 8,304  
2019 8,554  
2020 8,844  
2021 9,074  
Thereafter 47,262  
Future payments due 85,985  
Other Postretirement Benefit Plan [Member]    
Defined Benefit Plan Obligations    
2017 540  
2018 1,102  
2019 1,143  
2020 1,176  
2021 1,210  
Thereafter 6,246  
Future payments due $ 11,417  
Minimum    
Capital Lease Obligations    
Imputed interest rate on capital leases 0.82%  
Maximum    
Capital Lease Obligations    
Imputed interest rate on capital leases 10.70%  
Revolving Credit Facility    
Revolving Credit Facility    
2017 $ 18,532  
2018 0  
2019 0  
2020 0  
2021 0  
Thereafter 0  
Future minimum debt maturities 18,532  
New Facility Construction and Equipment Costs [Member]    
Purchase Commitments    
2017 20,677  
2018 0  
2019 0  
2020 0  
2021 0  
Thereafter 0  
Future minimum purchase commitments 20,677  
Texas Facility Construction Contract [Member]    
Purchase Commitments    
2017 9,900  
Texas Facility Equipment Contract [Member]    
Purchase Commitments    
2017 $ 10,800