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PROPERTY, PLANT AND EQUIPMENT (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jan. 31, 2017 a
Property, plant and equipment |  |  |  |
Property, plant and equipment, gross | $ 128,778,000 | $ 125,274,000 |  |
Accumulated depreciation and amortization | (59,672,000) | (52,002,000) |  |
Total property, plant and equipment | 69,106,000 | 73,272,000 |  |
Depreciation expense | 8,500,000 | 4,700,000 | $ 4,400,000 |
Interest costs capitalized | 100,000 | 199,000 | $ 0 |
Real estate held for sale |  | 500,000 |  |
Impairment of real estate |  | 200,000 |  |
Land and improvements |  |  |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment, gross | 841,000 | 1,996,000 |  |
Buildings and improvements |  |  |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment, gross | 30,760,000 | 30,277,000 |  |
Machinery and equipment |  |  |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment, gross | 25,160,000 | 23,699,000 |  |
Furniture and fixtures |  |  |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment, gross | 20,385,000 | 19,962,000 |  |
Computer software and hardware |  |  |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment, gross | $ 51,632,000 | $ 49,340,000 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |
Property, plant and equipment |  |  |  |
Acre of land | a |  |  |  | 53

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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