v2.4.0.6

Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2011
Supplemental Cash Flow Information [Abstract] |
Supplemental Disclosure of Cash Flow Information and Non-cash Investing and Financing Activities | The following table is a summary of the supplemental cash flow information during the years ended December 31, 2011, 2010 and 2009.
| Years Ended December 31,
| 2011 |  | 2010 |  | 2009
Supplemental disclosure of cash flow information: |  |  |  |  |
Interest paid | $ | 404,443 |  |  | $ | 409,293 |  |  | $ | 331,681 |
Income taxes paid (refund) | 4,340 |  |  | (5,935 | ) |  | 5,597 |
Supplemental disclosure of non-cash investing and financing activities: |  |  |  |  |
Increase (decrease) in the fair value of forward-starting interest rate swaps (note 7) | — |  |  | (114,157 | ) |  | (140,397 | )
Assets acquired through capital leases and installment sales | 27,094 |  |  | 18,682 |  |  | 17,351 |

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