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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2012
Changes in Operating Assets and Liabilities | a) The changes in operating assets and liabilities for years ended December 31, 2012, 2011 and 2010 are as follows:
|  | Year Ended December 31, 2012 $ |  |  | Year Ended December 31, 2011 $ |  |  | Year Ended December 31, 2010 $ |
Accounts receivable |  |  | 513 |  |  |  | 5,441 |  |  |  | (8,392 | )
Prepaid expenses |  |  | (920 | ) |  |  | 995 |  |  |  | 692 |
Accounts payable |  |  | (1,124 | ) |  |  | (1,053 | ) |  |  | (326 | )
Accrued liabilities |  |  | (8,606 | ) |  |  | 8,068 |  |  |  | (3,255 | )
Unearned revenue and long-term unearned revenue |  |  | 7,996 |  |  |  | (5,809 | ) |  |  | (1,183 | )
Restricted cash |  |  | (1,464 | ) |  |  | (2,747 | ) |  |  | — |
Advances to and from affiliates and joint venture partners |  |  | (7,259 | ) |  |  | (42,551 | ) |  |  | 12,880 |
Other operating assets and liabilities |  |  | 3,557 |  |  |  | 4,198 |  |  |  | 6,241 |
Total |  |  | (7,307 | ) |  |  | (33,458 | ) |  |  | 6,657 |

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- Definition Tabular disclosure of the net increase (decrease) in operating capital in the operating section of the statement of cash flows, represents the entire footnote disclosure that provides details regarding the net change during the reporting period of all assets and liabilities used in operating activities. + References No definition available. + Details
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