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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2013
Components of Inventories | The components of inventories are as follows (dollars in thousands):
| December 31
| 2013 |  | 2012
Raw materials | $ | 212,027 |  |  | $ | 125,909 |
Work in process | 13,898 |  |  | 8,287 |
Finished goods | 209,972 |  |  | 78,788 |
Supplies and materials | 158,394 |  |  | 119,284 |
Inventories at FIFO or average cost | 594,291 |  |  | 332,268 |
Excess of FIFO or average cost over LIFO cost | (71,768 | ) |  | (63,501 | )
Inventories | $ | 522,523 |  |  | $ | 268,767 |
Property, Plant and Equipment (at cost) | Property, plant, and equipment consist of the following (dollars in thousands):
| December 31
| 2013 |  | 2012
Land and land improvements | $ | 140,592 |  |  | $ | 107,250 |
Buildings | 628,948 |  |  | 390,363 |
Machinery and equipment | 4,263,505 |  |  | 3,048,932 |
Construction in progress | 168,808 |  |  | 67,051 |
Other | 30,847 |  |  | 27,196 |
Property, plant and equipment, at cost | 5,232,700 |  |  | 3,640,792 |
Less accumulated depreciation | (2,426,996 | ) |  | (2,274,723 | )
Property, plant, and equipment, net | $ | 2,805,704 |  |  | $ | 1,366,069 |
Property, Plant and Equipment Estimated Useful Lives | Depreciation is computed on the straight-line basis over the estimated useful lives of the related assets. Assets under capital leases are depreciated on the straight-line method over the term of the lease or the useful life, if shorter. The following lives are used for the various categories of assets:
Buildings and land improvements | 5 to 40 years
Machinery and equipment | 3 to 25 years
Trucks and automobiles | 3 to 10 years
Furniture and fixtures | 3 to 20 years
Computers and hardware | 3 to 10 years
| Period of the lease or
Leasehold improvements | useful life, if shorter

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: 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 Reference 2: 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 2 -Paragraph 6 -Subparagraph a,b,c -Article 5 + Details
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