| Summary of property, plant and equipment |
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December 31,
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2017
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2016
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Land
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$
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2,378
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$
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2,378
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Land improvements
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4,357
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4,357
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Leasehold improvements
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4,183
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2,569
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Buildings
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26,846
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26,058
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Machinery and equipment
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44,618
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40,878
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Furniture and fixtures
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13,681
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12,561
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Mobile equipment and other
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4,576
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3,873
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Construction-in-process
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4,320
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3,850
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Total property, plant and equipment
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104,959
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96,524
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Less accumulated depreciation
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(50,997)
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(44,383)
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Net property, plant and equipment
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$
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53,962
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$
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52,141
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