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Acquisitions (Tables)

12 Months Ended

Dec. 31, 2019

Business Combinations [Abstract]

Schedule of useful lives of property, plant and equipment

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 consists of:

			December 31,
			2019						2018
Machinery, equipment and tooling			$	19,683					$	14,858
SmartSystems			15,811						5,286
Vehicles			2,419						1,955
Furniture and fixtures			1,228						1,140
Plant and building			170,283						158,882
Real estate properties			4,946						4,601
Railroad and sidings			27,701						27,347
Land and land improvements			21,320						27,167
Asset retirement obligation			11,480						16,469
Mineral properties			7,442						10,075
Deferred mining costs			2,004						1,806
Construction in progress			9,208						21,619
			293,525						291,205
Less: accumulated depreciation and depletion			63,064						42,809
Total property, plant and equipment, net			$	230,461					$	248,396

Schedule of consideration transferred

The table below presents the calculation of the total purchase consideration:

Base price - cash			$	30,000
Contingent consideration – earnout			9,200
Working capital adjustment			(122)
Total purchase consideration			$	39,078

Schedule of assets acquired and liabilities assumed

The Company’s allocation of the purchase price in connection with the acquisition was calculated as follows.

						Fair Value						Useful Life
Assets Acquired
Accounts receivable						$	112
Inventory						1,700
Prepaid expenses and other current assets						126
Total current assets acquired						$	1,938
Property, plant and equipment						740
Customer relationships						270						1 year
Developed technology						18,800						13 years
Trade name						900						Indefinite
Goodwill						16,935
Other assets						225
Total non-current assets acquired						37,870
Total assets acquired						$	39,808
Liabilities Assumed
Accounts payable						$	331
Accrued and other expenses						399
Total liabilities assumed						730
Estimated fair value of net assets acquired						$	39,078

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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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Tabular disclosure of a material business combination completed during the period, including background, timing, and recognized assets and liabilities. This table does not include leveraged buyouts.

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Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree.

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