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Additional Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Changes in operating assets and liabilities, net of effect of businesses acquired [Abstract] |  |  |
Accounts receivable | $ 61,918 | $ (89,261) | $ 29,055
Inventories | (13,829) | (54,358) | 79,415
Prepaid expenses and other current assets | (14,273) | (22,637) | 43,549
Accounts payable | (11,468) | 59,568 | 12,838
Other current liabilities | (74,851) | 108,418 | (56,107)
Net change in operating assets and liabilities | $ (52,503) | $ 1,730 | $ 108,750

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- Definition Change in recurring obligations of a business that arise from the acquisition of merchandise, materials, supplies and services used in the production and sale of goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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