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Property, Plant & Equipment | 3 Months Ended
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Mar. 31, 2019
Property, Plant and Equipment [Abstract] |
Property, Plant & Equipment | Property, plant and equipment consisted of the following for the periods specified:
| March 31, 2019 |  | December 31, 2018
Property, plant and equipment | $ | 167,696,000 |  |  | $ | 164,145,000 |
Accumulated depreciation | (85,514,000 | ) |  | (83,488,000 | )
Property, plant and equipment — net | $ | 82,182,000 |  |  | $ | 80,657,000 |
Property, plant, and equipment are recorded at cost, unless obtained through acquisition, then assets are recorded at estimated fair value at the date of acquisition. Depreciation is provided on a straight-line method over the estimated useful lives of the assets. The carrying amount of long-lived assets is evaluated annually to determine if an adjustment to the depreciation period or to the unamortized balance is warranted. Depreciation expense for the three months ended March 31, 2019 and 2018 was $2,026,000 and $1,833,000, respectively. Amounts invested in capital additions in progress were $7,164,000 and $5,014,000 at March 31, 2019 and December 31, 2018, respectively. At March 31, 2019 and December 31, 2018, purchase commitments for capital expenditures in progress were $2,705,000 and $3,461,000, respectively.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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