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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 | Property, Plant and Equipment
|  | December 31,
(In thousands) |  | 2017 |  | 2016
Machinery and equipment |  | $ | 2,124,701 |  |  | $ | 2,000,512 |
Buildings and improvements |  | 340,042 |  |  | 328,251 |
Land improvements |  | 49,908 |  |  | 47,844 |
Office and other equipment |  | 46,467 |  |  | 40,051 |
Land |  | 11,726 |  |  | 7,266 |
Construction in progress |  | 114,424 |  |  | 103,429 |
|  | $ | 2,687,268 |  |  | $ | 2,527,353 |
Less accumulated depreciation and amortization |  | (1,636,286 | ) |  | (1,582,025 | )
|  | $ | 1,050,982 |  |  | $ | 945,328 |
The December 31, 2017 and 2016 buildings and improvements and machinery and equipment combined balances include $24.4 million associated with capital leases. Depreciation expense, including amounts associated with capital leases, totaled $97.0 million, $86.1 million and $79.8 million in 2017, 2016 and 2015, respectively. For 2017, 2016, and 2015, we capitalized $4.6 million, $2.3 million and $0.4 million, respectively, of interest expense associated with the construction of a continuous pulp digester at our Lewiston, Idaho pulp and paperboard mill and the construction of a paper machine at our Shelby, North Carolina consumer products facility. On November 29, 2016, we announced the permanent closure of our Oklahoma City converting facility, effective March 31, 2017, and the permanent shutdown of two of the five tissue machines at our Neenah, Wisconsin, tissue facility, effective late-December 2016. In association with the March 31, 2017 closure of the Oklahoma City facility, we recorded accelerated depreciation of $3.7 million in the first quarter of 2017 and $1.3 million in the fourth quarter of 2016.

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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=64827811&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=64862545&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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