Summary of Property, Plant, and Equipment |
Depreciation expense is computed primarily using the straight-line method over the estimated useful lives of the assets, which are as follows: | | | | Asset Classification | | Estimated Useful Life | Buildings | | 30 years | Computer equipment | | 5 years | Furniture and fixtures | | 7 years | Leasehold improvements | | Shorter of asset's useful life or remaining life of lease | Machinery and equipment | | 7 years | Vehicles | | 5 years |
Property, plant, and equipment, net is comprised of the following (in thousands):
| | | | | | | | | | December 31, 2018 | | December 31, 2017 | Land | $ | 1,572 |
| | $ | 5,275 |
| Buildings | 233,185 |
| | 227,864 |
| Leasehold improvements | 98,399 |
| | 70,354 |
| Machinery and equipment | 334,351 |
| | 260,637 |
| Furniture and fixtures | 10,779 |
| | 18,415 |
| Vehicles | 1,506 |
| | 1,517 |
| Computer equipment | 33,019 |
| | 26,831 |
| Construction-in-progress | 40,771 |
| | 32,235 |
| Total property, plant, and equipment | 753,582 |
| | 643,128 |
| Less: Accumulated depreciation | (209,436 | ) | | (156,370 | ) | Property, plant, and equipment, net | $ | 544,146 |
| | $ | 486,758 |
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Depreciation recognized by the Company is as follows (in thousands): | | | | | | | | | | | | | | Years Ended December 31, |
| 2018 | | 2017 | | 2016 | Depreciation | $ | 64,417 |
| | $ | 41,962 |
| | $ | 29,314 |
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