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PROPERTY AND EQUIPMENT. | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
PROPERTY AND EQUIPMENT. |
5. | PROPERTY AND EQUIPMENT.
Property and equipment consisted of the following (in thousands):
|  | December 31, |
|  | 2017 |  |  | 2016 |
Facilities and plant equipment |  | $ | 601,156 |  |  | $ | 530,735 |
Land |  |  | 8,970 |  |  |  | 7,771 |
Other equipment, vehicles and furniture |  |  | 10,189 |  |  |  | 9,714 |
Construction in progress |  |  | 38,041 |  |  |  | 29,393 |
|  |  | 658,356 |  |  |  | 577,613 |
Accumulated depreciation |  |  | (150,004 | ) |  |  | (112,423 | )
|  | $ | 508,352 |  |  | $ | 465,190 |
Depreciation expense was $38,651,000, $35,441,000 and $23,632,000 for the years ended December 31, 2017, 2016 and 2015, respectively. For the year ended December 31, 2015, the Company recorded an impairment charge of $1,970,000 related to the abandonment of certain accounting and information technology systems following the integration of its PE Central facilities. For the year ended December 31, 2017 and 2016, the Company capitalized interest of $822,000 and $1,307,000, respectively, related to its capital investment activities.

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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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