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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | 14. Property, Plant and Equipment The table below sets forth the components of property, plant and equipment as of December 31, 2018 and 2017:
(in thousands) | 2018 |  | 2017 |  | Estimated useful life
Land and land improvements | $14,287 |  | $14,853 |  | 25 years for improvements
Buildings | 245,805 |  | 239,127 |  | 15 to 40 years
Machinery and equipment | 989,925 |  | 950,519 |  | 5 to 15 years
Furniture and fixtures | 8,091 |  | 8,861 |  | 5 years
Computer and other equipment | 16,473 |  | 15,610 |  | 3 to 10 years
Software | 60,182 |  | 57,847 |  | 5 to 8 years
Capital expenditures in progress | 46,749 |  | 63,951 |  |
Property, plant and equipment, gross | 1,381,512 |  | 1,350,768 |  |
Accumulated depreciation and amortization | (919,457 | ) | (896,466 | ) |
Property, plant and equipment, net | $462,055 |  | $454,302 |  |
Depreciation expense was $68.8 million in 2018, $61.5 million in 2017, and $58.1 million in 2016. Software amortization is recorded in Selling, general, and administrative expense and was $3.2 million in 2018, $3.6 million in 2017, and $4.0 million in 2016. Capital expenditures, including purchased software, were $82.9 million in 2018, $87.6 million in 2017, and $73.5 million in 2016. Unamortized software cost was $6.9 million and $7.6 million as of December 31, 2018 and 2017, respectively. Expenditures for maintenance and repairs are charged to income as incurred and amounted to $19.4 million in 2018, $19.1 million in 2017, and $16.6 million in 2016. Included in Buildings in the above table is the capitalized value of our primary manufacturing facility in Salt Lake City, Utah, which is accounted for as a build-to-suit lease with a failed sale-leaseback. As described in Note 3, during 2018 AEC finalized a modification to the lease, which includes additional manufacturing space, extends the minimum lease period until December 31, 2029 and resulted in an increase of $12.7 million to Property, plant and equipment, net (see discussion of Finance obligation in Note 17).

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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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