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PROPERTY, PLANT AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2017
PROPERTY, PLANT AND EQUIPMENT |
PROPERTY, PLANT AND EQUIPMENT | NOTE 4: PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment are presented at cost, net of accumulated depreciation, and consist of the following:
December 31, |  | Estimated Useful Lives |  | 2017 |  |  | 2016 |
(in thousands) |  |  |  |  |  |  |  |  |  |
Land |  | N/A |  | $ | 878 |  |  | $ | 878 |
Buildings |  | 7-40 |  |  | 19,611 |  |  |  | 18,314 |
Operating equipment and property |  | 3-15 |  |  | 10,360 |  |  |  | 10,070 |
Furniture and fixtures |  | 5-7 |  |  | 1,488 |  |  |  | 1,535 |
Vehicles |  | 5-10 |  |  | 6,276 |  |  |  | 6,007 |
Gross property, plant and equipment |  |  |  |  | 38,613 |  |  |  | 36,804 |
Less: accumulated depreciation |  |  |  |  | (24,395 | ) |  |  | (23,470 | )
Net property, plant and equipment |  |  |  | $ | 14,218 |  |  | $ | 13,334 |
Depreciation expense was $1,526,000 in 2017, $1,382,000 in 2016 and $1,013,000 in 2015. The Company’s accounts payable for purchases of property and equipment was immaterial as of December 31, 2017, December 31, 2016 and December 31, 2015.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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