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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | 7. PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment are stated at cost and are depreciated and amortized over a period of three to 39 years generally under the straight-line method for financial reporting purposes and accelerated methods for income tax purposes. Property, plant and equipment as of December 31 were as follows (in thousands):
|  | 2017 |  |  | 2016 |
Land |  | $ | 2,089 |  |  | $ | 2,089 |
Buildings and improvements |  |  | 45,147 |  |  |  | 43,950 |
Machinery and equipment |  |  | 243,392 |  |  |  | 237,434 |
Furniture and fixtures |  |  | 6,320 |  |  |  | 5,656 |
Construction in-progress and deposits |  |  | 4,120 |  |  |  | 2,471 |
|  |  | 301,068 |  |  |  | 291,600 |
Accumulated depreciation and amortization |  |  | (259,712 | ) |  |  | (254,026 | )
Net balance |  | $ | 41,356 |  |  | $ | 37,574 |
Depreciation expense for the years ended December 31, 2017, 2016 and 2015 was approximately $8,763,000, $8,304,000, and $9,028,000 respectively. As of December 31, 2017, the Company had approximately $1,911,000 of capital expenditure commitments.

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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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