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Equity Method Investments | 6 Months Ended
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Jun. 30, 2019
Equity Method Investment, Summarized Financial Information [Abstract] |
Equity Method Investments | Equity Method Investments The Company had total equity method investments of $44.0 million and $45.9 million reflected in “Investments and other assets” in the condensed consolidated balance sheets as of June 30, 2019 and December 31, 2018, respectively, related to Middlemount Coal Pty Ltd (Middlemount). Included in “Income from equity affiliates” in the unaudited condensed consolidated statements of operations was $9.7 million and $25.5 million related to Middlemount during the three months ended June 30, 2019 and 2018, respectively and $13.5 million and $47.7 million during the six months ended June 30, 2019 and 2018, respectively. Middlemount’s standalone results include (on a 50% attributable basis):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
| (Dollars in millions)
Depreciation, depletion and amortization and asset retirement obligation expenses | $ | 3.5 |  |  | $ | 4.2 |  |  | $ | 7.1 |  |  | $ | 8.1 |
Net interest expense | 1.8 |  |  | 3.6 |  |  | 4.0 |  |  | 7.2 |
Income tax provision | 4.2 |  |  | 6.4 |  |  | 5.9 |  |  | 11.5 |
The Company received cash payments from Middlemount of $14.7 million and $69.8 million during the six months ended June 30, 2019 and 2018, respectively.

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