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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2015
Property, Plant and Equipment |
Property, Plant and Equipment | Note 4: Property, Plant and Equipment Property, plant and equipment are presented at cost net of accumulated depreciation and consist of the following:
December 31, |  | 2015 |  |  | 2014 |
(in thousands) |  |  |  |  |  |
Land |  | $ | 19,056 |  |  | $ | 18,563 |
Buildings and leasehold improvements |  |  | 142,715 |  |  |  | 134,994 |
Operating equipment |  |  | 1,440,508 |  |  |  | 1,425,846 |
Computer software |  |  | 19,650 |  |  |  | 19,005 |
Furniture and fixtures |  |  | 8,043 |  |  |  | 7,835 |
Vehicles |  |  | 480,899 |  |  |  | 479,628 |
Construction in progress |  |  | 6 |  |  |  | 2,675 |
Gross property, plant and equipment |  |  | 2,110,877 |  |  |  | 2,088,546 |
Less: accumulated depreciation |  |  | (1,422,542 | ) |  |  | (1,239,163 | )
Net property, plant and equipment |  | $ | 688,335 |  |  | $ | 849,383 |
Depreciation expense was $274.4 million in 2015, $233.4 million in 2014, and $215.4 million in 2013, and includes amounts recorded as costs of sales and inventory. There were no capital leases outstanding as of December 31, 2015 and December 31, 2014. The Company had accounts payable for purchases of property and equipment of $2.4 million as of December 31, 2015, $38.5 million as of December 31, 2014, and $19.7 million as of December 31, 2013. Effective January 1, 2015, the Company reassessed the useful life of a specific component of its pressure pumping equipment. Prior to January 1, 2015, this component was recorded as property, plant and equipment and depreciated over an expected useful life of 18 months. As a result of this reassessment, the Company has concluded that this component is no longer a long-lived asset, but instead a consumable supply inventory item. Accordingly, effective January 1, 2015, the cost of this component is being expensed as repairs and maintenance as part of cost of revenues at the time of installation. Management deemed the change preferable because it more closely reflects the pattern of consumption of this component as a result of continual increases in wear and tear resulting from harsher geological environments. This change was accounted for as a change in accounting estimate effected by a change in accounting principle. The net impact of this change in accounting estimate effected by a change in accounting principle on operating income and net income is not material. The change has resulted in an increase in the cost of revenues of $41,919,000 during 2015, while loss on dispositions and depreciation expense relating to this component decreased by a comparable amount during the period. Additionally, due to the change in accounting estimate effected by a change in accounting principle, purchases and deployment of this component will no longer be reflected as a capital expenditure under the investing activities section in the consolidated statement of cash flows, but instead will be reflected within cash flows from operating activities. The remaining net book value of these components at December 31, 2014 was $16,406,000 and was depreciated over an estimated weighted average remaining useful life of approximately 12 months. Loss on disposition related to this component totaled $21,408,000 in 2014.

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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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1361-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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