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Supplemental Cash Flow Information | 12 Months Ended
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Dec. 31, 2013
Supplemental Cash Flow Elements [Abstract] |
Supplemental Cash Flow Information | 14. Supplemental Cash Flow Information The following table provides information regarding the net changes in components of operating assets and liabilities:
| Year Ended December 31,
| 2013 |  | 2012 |  | 2011
(Increase) decrease in: |  |  |  |  |
Accounts receivable | $ | (96,300 | ) |  | $ | (34,299 | ) |  | $ | (66,208 | )
Inventories | 1,720 |  |  | 14,074 |  |  | (46,151 | )
Other current assets | (39,170 | ) |  | (9,593 | ) |  | (3,598 | )
Increase (decrease) in: |  |  |  |  |
Accounts payable | 41,718 |  |  | 53,146 |  |  | 33,049 |
Accrued liabilities | 45,846 |  |  | (10,263 | ) |  | 15,977 |
Net changes in components of operating assets and liabilities | $ | (46,186 | ) |  | $ | 13,065 |  |  | $ | (66,931 | )
Payments of interest and commitment fees, net of amounts capitalized, were $49.7 million, $41.5 million and $32.9 million during the years ended December 31, 2013, 2012 and 2011, respectively. We capitalized interest of $13.3 million, $3.9 million and $0.1 million during the years ended December 31, 2013, 2012 and 2011. During the year ended December 31, 2013, we paid taxes of $0.6 million. During the years ended December 31, 2012 and 2011 we received tax refunds, net of amounts paid, of $0.3 million and $0.1 million. At December 31, 2013, 2012 and 2011, we had incurred liabilities for fixed and intangible asset additions totaling $52.5 million, $14.1 million and $2 million, respectively, which had not been paid at the end of the year. Therefore, these amounts were not included in the caption “Payments to acquire fixed and intangible assets” under Cash Flows from Investing Activities in the Consolidated Statements of Cash Flows. At December 31, 2013, we had incurred liabilities for other asset additions totaling $0.1 million that had not been paid at the end of the year, and, therefore, were not included in the caption "Other, net" under Cash Flows from Investing Activities in the 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 + Details
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