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LEASE OBLIGATIONS | 9 Months Ended
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Sep. 30, 2018
Leases [Abstract] |
LEASE OBLIGATIONS | NOTE 12 - LEASE OBLIGATIONS We lease certain building space, mining, production and other equipment under operating and capital leases. The capital leases are for varying lengths, generally at market interest rates and contain purchase and/or renewal options at the end of the terms. Our operating lease expense was $1.1 million and $2.9 million for the three and nine months ended September 30, 2018, respectively, compared with $1.2 million and $3.5 million for the comparable period in 2017. Future minimum payments under capital leases and non-cancellable operating leases as of September 30, 2018 are as follows:
| (In Millions)
| Capital Leases |  | Operating Leases
2018 (October 1 - December 31) | $ | 1.1 |  |  | $ | 1.1 |
2019 | 3.9 |  |  | 3.5 |
2020 | 3.7 |  |  | 3.1 |
2021 | 3.0 |  |  | 2.4 |
2022 | 6.2 |  |  | 1.8 |
2023 and thereafter | — |  |  | 7.5 |
Total minimum lease payments | $ | 17.9 |  |  | $ | 19.4 |
Amounts representing interest | 2.1 |  |  |
Present value of net minimum lease payments 1 | $ | 15.8 |  |  |
1 The total is comprised of $3.4 million and $12.4 million classified as Other current liabilities and Other liabilities, respectively, in the Statements of Unaudited Condensed Consolidated Financial Position as of September 30, 2018.

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- Definition The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=77888251 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -URI http://asc.fasb.org/topic&trid=2208923 + Details
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