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Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 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
Wellsite storage solutions	5-15
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:

	September 30, 2018				December 31, 2017
Machinery, equipment and tooling	$	11,179			$	7,802
Wellsite storage solutions	307				—
Vehicles	1,735				1,546
Furniture and fixtures	837				720
Plant and building	147,642				81,561
Real estate properties	4,441				4,432
Railroad and sidings	25,691				10,254
Land and land improvements	24,981				16,378
Asset retirement obligation	10,484				8,408
Mineral properties	10,074				9,878
Deferred mining costs	782				657
Construction in progress	32,363				56,493
	270,516				198,129
Less: accumulated depreciation and depletion	37,335				26,367
Total property, plant and equipment, net	$	233,181			$	171,762

Schedule of contingent consideration

The fair value of the Company’s financial instruments carried at fair value were as follows:

		September 30, 2018				Level 1				Level 2				Level 3
Contingent consideration		$	7,100			$	—			$	—			$	7,100
Total liabilities		$	7,100			$	—			$	—			$	7,100

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 nine months ended September 30, 2018:

Balance as of January 1, 2018		$	—
Contingent consideration pursuant to acquisition		9,200
Payment of contingent consideration		—
Unrealized gain		(2,100		)
Balance as of September 30, 2018		$	7,100

Schedule of accumulated other comprehensive income (loss)

The following table presents the changes in accumulated other comprehensive income during the three and nine months ended September 30, 2018.

		Three Months Ended September 30, 2018				Nine Months Ended September 30, 2018
		Foreign currency translation adjustments				Foreign currency translation adjustments
Beginning balance		$	76			$	—
Other comprehensive income before reclassifications		(130		)		(54		)
Amounts reclassed from accumulated other comprehensive income		—				—
Ending balance		$	(54	)		$	(54	)

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 September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Weighted average common shares outstanding	40,541			40,384			40,483			40,145
Assumed conversion of restricted stock	10			32			65			112
Diluted weighted average common stock outstanding	40,551			40,416			40,548			40,257

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