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Commitments and Contingencies - Contractual Obligations (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Jun. 30, 2016
--- | --- | ---
Capital Lease Obligations |  |
2017 | $ 341 |
2018 | 990 |
2019 | 186 |
2020 | 51 |
2021 | 4 |
Thereafter | 0 |
Total minimum lease payments | 1,572 |
Less: imputed interest (0.82% to 10.7%) | (52) |
Present value of future minimum lease payments | 1,520 |
Less: current portion | 1,131 | $ 1,323
Other long-term liabilities-capital leases | 389 | $ 1,036
Operating Lease Obligations |  |
2017 | 1,233 |
2018 | 4,684 |
2019 | 3,798 |
2020 | 2,133 |
2021 | 798 |
Thereafter | 186 |
Future Minimum Payments Due | 12,832 |
Purchase Commitments |  |
2017 | 41,919 |
2018 | 37,584 |
2019 | 0 |
2020 | 0 |
2021 | 0 |
Thereafter | 0 |
Future minimum purchase commitments | $ 79,503 |
Minimum |  |
Purchase Commitments |  |
Imputed interest rate on capital leases | 0.82% |
Maximum |  |
Purchase Commitments |  |
Imputed interest rate on capital leases | 10.70% |
Pension Plan |  |
Defined Benefit Plan Obligations |  |
2017 | $ 1,973 |
2018 | 8,304 |
2019 | 8,554 |
2020 | 8,844 |
2021 | 9,074 |
Thereafter | 47,262 |
Future payments due | 84,011 |
Other Postretirement Benefit Plan |  |
Defined Benefit Plan Obligations |  |
2017 | 270 |
2018 | 1,102 |
2019 | 1,143 |
2020 | 1,176 |
2021 | 1,210 |
Thereafter | 6,246 |
Future payments due | 11,147 |
Revolving Credit Facility |  |
Revolving Credit Facility |  |
2017 | 44,175 |
2018 | 0 |
2019 | 0 |
2020 | 0 |
2021 | 0 |
Thereafter | 0 |
Future minimum debt maturities | 44,175 |
New Facility Construction and Equipment Costs [Member] |  |
Purchase Commitments |  |
2017 | 11,698 |
2018 | 0 |
2019 | 0 |
2020 | 0 |
2021 | 0 |
Thereafter | 0 |
Future minimum purchase commitments | 11,698 |
Texas Facility Construction Contract [Member] |  |
Purchase Commitments |  |
2017 | 5,500 |
Texas Facility Equipment Contract [Member] |  |
Purchase Commitments |  |
2017 | $ 6,200 |

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- Definition Amount of capital lease obligation due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45023-112735 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45023-112735 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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