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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2018
Accounting Policies [Abstract] |
Schedule of useful lives of property, plant and equipment | Depreciation is calculated using the straight-line method over the estimated useful lives of the property, plant and equipment, which are:
| Years
Land improvements | 10
Plant and buildings | 5-15
Real estate properties | 10-40
Railroad and sidings | 30
Vehicles | 3-5
Machinery, equipment and tooling | 3-15
Furniture and fixtures | 3-10
Deferred stripping costs | 3
The acquisition cost has been allocated over the assets as set forth below.
Machinery, equipment and tooling | $ | 1,478 |
Plant and building | 1,407 |
Railroad and sidings | 9,926 |
Land improvements | 2,738 |
Total assets acquired | $ | 15,549 |
Net property, plant and equipment consisted of:
| June 30, 2018 |  | December 31, 2017
Machinery, equipment and tooling | $ | 11,791 |  |  | $ | 7,802 |
Vehicles | 1,671 |  |  | 1,546 |
Furniture and fixtures | 760 |  |  | 720 |
Plant and building | 143,622 |  |  | 81,561 |
Real estate properties | 4,441 |  |  | 4,432 |
Railroad and sidings | 25,691 |  |  | 10,254 |
Land improvements | 25,870 |  |  | 16,378 |
Asset retirement obligation | 10,493 |  |  | 8,408 |
Mineral properties | 9,879 |  |  | 9,878 |
Deferred mining costs | 782 |  |  | 657 |
Construction in progress | 22,527 |  |  | 56,493 |
| 257,527 |  |  | 198,129 |
Less: accumulated depreciation and depletion | 33,534 |  |  | 26,367 |
Total property, plant and equipment, net | $ | 223,993 |  |  | $ | 171,762 |
Schedule of contingent consideration | The fair value of the Company’s financial instruments carried at fair value were as follows:
|  | June 30, 2018 |  | Level 1 |  | Level 2 |  | Level 3
Contingent consideration |  | $ | 9,200 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,200 |
Total liabilities |  | $ | 9,200 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,200 |
Fair value, liabilities measured on recurring basis, unobservable input reconciliation | The following table provides a summary of changes in the fair value of the Company’s Level 3 financial instruments for the six months ended June 30, 2018:
Balance as of January 1, 2017 |  | $ | — |
Contingent consideration pursuant to acquisition |  | 9,200 |
Payment of contingent consideration |  | — |
Change in fair value of contingent consideration |  | — |
Balance as of June 30, 2017 |  | $ | 9,200 |
Schedule of accumulated other comprehensive income (loss) | The following table presents the changes in accumulated other comprehensive income during the three and six months ended June 30, 2018.
|  | Three Months Ended June 30, 2018 |  | Six Months Ended June 30, 2018
|  | Foreign currency translation adjustments |  | Foreign currency translation adjustments
Beginning balance |  | $ | — |  |  | $ | — |
Other comprehensive income before reclassifications |  | 76 |  |  | 76 |
Amounts reclassed from accumulated other comprehensive income |  | — |  |  | — |
Ending balance |  | $ | 76 |  |  | $ | 76 |
Reconciliation of weighted-average common shares outstanding used in the calculation of basic and diluted net income (loss) per share | The following table reconciles the weighted-average common shares outstanding used in the calculation of basic net income per share to the weighted average common shares outstanding used in the calculation of diluted net income per share:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Weighted average common shares outstanding | 40,499 |  |  | 40,347 |  |  | 40,455 |  |  | 40,024 |
Assumed conversion of restricted stock | 51 |  |  | 106 |  |  | 95 |  |  | 143 |
Diluted weighted average common stock outstanding | 40,550 |  |  | 40,453 |  |  | 40,550 |  |  | 40,167 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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