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Accounts Receivable and Inventories (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Accounts Receivable, Net, Current [Abstract] |  |  |  |  |
Trade accounts receivable | $ 617,517,000 |  | $ 636,304,000 |  |
Less: Allowance for doubtful accounts | (17,253,000) |  | (17,829,000) |  |
Trade accounts receivable, net | 600,264,000 |  | 618,475,000 |  |
Other receivables | 39,836,000 | [1] | 44,431,000 | [1] |
Provision for doubtful accounts related to trae accounts receivable | 11,266,000 |  | 7,880,000 |  | 9,962,000
Inventories |  |  |  |  |
Finished goods | 69,904,000 |  | 78,445,000 |  |
Work-in-process | 28,944,000 |  | 34,041,000 |  |
Raw materials and purchased parts | 99,058,000 |  | 92,995,000 |  |
Stores and supplies | 38,606,000 |  | 36,453,000 |  |
Total inventories | 236,512,000 |  | 241,934,000 |  |
Valued at lower of cost or market: |  |  |  |  |
LIFO basis | 108,633,000 |  | 115,523,000 |  |
FIFO basis | 14,641,000 |  | 13,087,000 |  |
Average cost basis | 113,238,000 |  | 113,324,000 |  |
Total inventories | 236,512,000 |  | 241,934,000 |  |
Excess of inventories valued at current costs over LIFO | 28,500,000 |  | 28,600,000 |  |
Change in income as a result of LIFO basis inventory valuation over FIFO basis valuation | $ 100,000 |  | $ 100,000 |  | $ 400,000
[1] | Other receivables include insurance claim receivables, employee receivables, tax claim receivables and other miscellaneous receivables not included in Trade accounts receivable, net.

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- Definition Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. + 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 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Subparagraph a, b -Article 5 + Details
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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The excess of replacement or current cost over the stated LIFO (last in first out) inventory value when the LIFO inventory method is utilized. + 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 210.5-02.6(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph c -Article 5 + Details
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- Definition The amount of FIFO (first in first out) inventory present at the reporting date when inventory is also valued using different valuation methods. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section A -Paragraph 9 -Chapter 3 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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