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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | 11. Property, Plant and Equipment The table below sets forth the reclassification and components of property, plant and equipment as of December 31, 2017 and 2016:
(in thousands) |  | 2017 |  | 2016 |  | Estimated useful life
Land and land improvements |  | $14,853 |  |  | $13,339 |  |  | 25 years for improvements
Buildings |  | 230,987 |  |  | 214,086 |  |  | 25 to 40 years
Building under capital lease |  | 8,140 |  |  | 8,140 |  |  | 7 years
Machinery and equipment |  | 950,519 |  |  | 842,921 |  |  | 5 to 15 years
Furniture and fixtures |  | 8,861 |  |  | 7,632 |  |  | 5 years
Computer and other equipment |  | 15,610 |  |  | 15,264 |  |  | 3 to 10 years
Software |  | 57,847 |  |  | 54,212 |  |  | 5 to 8 years
Capital expenditures in progress |  | 63,951 |  |  | 66,900 |  |  |
Property, plant and equipment, gross |  | 1,350,768 |  |  | 1,222,494 |  |  |
Accumulated depreciation and amortization |  | (896,466 | ) |  | (799,930 | ) |  |
Property, plant and equipment, net |  | $454,302 |  |  | $422,564 |  |  |
Depreciation expense was $61.5 million in 2017, $58.1 million in 2016, and $53.0 million in 2015. Software amortization is recorded in Selling, general, and administrative expense and was $3.6 million in 2017, $4.0 million in 2016, and $6.5 million in 2015. We include amortization of the capital lease in depreciation expense. Accumulated amortization of the capital lease was $2.4 million and $0.9 million as of December 31, 2017 and 2016, respectively. Capital expenditures, including purchased software, were $87.6 million in 2017, $73.5 million in 2016, and $50.6 million in 2015. Unamortized software cost was $7.6 million and $7.2 million as of December 31, 2017 and 2016, respectively. Expenditures for maintenance and repairs are charged to income as incurred and amounted to $19.1 million in 2017, $16.6 million in 2016, and $16.6 million in 2015.

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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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