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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 | Property, Plant, and Equipment Property, plant, and equipment at December 31, 2017 and 2016 consist of the following:
|  | 2017 |  | 2016
Land |  | $ | 14,869 |  |  | $ | 14,826 |
Improvements to land and leaseholds |  | 17,415 |  |  | 17,408 |
Buildings |  | 34,929 |  |  | 33,910 |
Machinery and equipment, including equipment under capitalized leases |  | 120,806 |  |  | 118,060 |
Construction in progress |  | 1,057 |  |  | 1,291 |
|  | 189,076 |  |  | 185,495 |
Less: accumulated depreciation and amortization, including accumulated amortization of capitalized leases |  | 92,980 |  |  | 81,522 |
|  | $ | 96,096 |  |  | $ | 103,973 |
There were no impairments of property, plant, and equipment recorded during the years ended December 31, 2017 or 2015. During the year ended December 31, 2016, the Company performed recoverability tests on reporting units when it was more likely than not that the carrying value of the long-lived asset group would not be recoverable. The results of our testing indicated that the long-lived assets related to the IOS business, within the Tubular and Energy Services segment, had carrying values in excess of the asset groups’ fair value. Based upon level 3 unobservable inputs, the Company incorporated assumptions that it believes would be a reasonable market participant’s view in a hypothetical purchase, to develop the discounted cash flows. Significant level 3 inputs included estimates of future revenue growth, gross margin, and EBITDA. As a result of the analysis, the Company recorded a $14,956 non-cash impairment of property, plant and equipment related to the IOS business. Depreciation expense, including amortization of assets under capital leases, for the years ended December 31, 2017, 2016, and 2015 amounted to $12,849, $13,917, and $14,429, 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://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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