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Summary of Significant Accounting Policies (Tables)

6 Months Ended

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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Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.

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Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.

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