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Property, Plant and Equipment, net | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, net | 7. Property, Plant and Equipment, net Property, plant and equipment, net, consisted of the following (in thousands):
| December 31,
| 2018 |  | 2017
Compression equipment, facilities and other fleet assets | $ | 3,323,465 |  |  | $ | 3,192,363 |
Land and buildings | 47,067 |  |  | 45,754 |
Transportation and shop equipment | 103,766 |  |  | 100,133 |
Computer hardware and software | 92,174 |  |  | 90,296 |
Other | 11,880 |  |  | 12,419 |
Property, plant and equipment | 3,578,352 |  |  | 3,440,965 |
Accumulated depreciation | (1,407,314 | ) |  | (1,364,038 | )
Property, plant and equipment, net | $ | 2,171,038 |  |  | $ | 2,076,927 |
Depreciation expense was $158.4 million, $170.8 million and $191.1 million during the years ended December 31, 2018, 2017 and 2016, respectively. Assets under construction of $55.4 million and $67.9 million at December 31, 2018 and 2017, respectively, were primarily included in compression equipment.

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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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