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Supplemental Cash Flow Information | 3 Months Ended
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Mar. 31, 2013
Supplemental Cash Flow Elements [Abstract] |
Supplemental Cash Flow Information | 10. Supplemental Cash Flow Information The following table provides information regarding the net changes in components of operating assets and liabilities.
| Three Months Ended March 31,
| 2013 |  | 2012
(Increase) decrease in: |  |  |
Accounts receivable | $ | (85,915 | ) |  | $ | (55,904 | )
Inventories | 7,947 |  |  | (2,307 | )
Other current assets | 4,736 |  |  | (2,327 | )
Increase (decrease) in: |  |  |
Accounts payable | 57,048 |  |  | 52,055 |
Accrued liabilities | 6,019 |  |  | (8,785 | )
Net changes in components of operating assets and liabilities | $ | (10,165 | ) |  | $ | (17,268 | )
Payments of interest and commitment fees were $2.8 million and $5.2 million for the three months ended March 31, 2013 and March 31, 2012, respectively. At March 31, 2013 and March 31, 2012, we had incurred liabilities for fixed and intangible asset additions totaling $5 million and $4.1 million, respectively, that had not been paid at the end of the first quarter, and, therefore, were not included in the caption “Payments to acquire fixed and intangible assets” under Cash Flows from Investing Activities in the Unaudited Condensed Consolidated Statements of Cash Flows. At March 31, 2013, we had incurred liabilities for other asset additions totaling $0.3 million that had not been paid at the end of the first quarter, and, therefore, were not included in the caption "Other, net" under Cash Flows from Investing Activities in the Unaudited Condensed Consolidated Statements of Cash Flows.

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- Definition The entire disclosure for supplemental cash flow activities, including cash, noncash, and part noncash transactions, for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -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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