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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2011
Supplemental Cash Flow Elements [Abstract] |
Supplemental cash flow information |
|  | Year Ended December 31,
|  | 2011 |  | 2010 |  | 2009
Supplemental disclosure of cash flow information: |  |  |  |  |  |
Interest paid |  | $ | 10.4 |  |  | $ | 6.0 |  |  | $ | 2.0 |
Income taxes paid |  | $ | 3.5 |  |  | $ | 0.8 |  |  | $ | 12.8 |
Supplemental disclosure of non-cash transactions: |  |  |  |  |  |
Non-cash capital expenditures |  | $ | 1.8 |  |  | $ | 1.7 |  |  | $ | 5.3 |
Issuance of Nichols Promissory Note — Note 4 |  | $ | — |  |  | $ | 6.7 |  |  | $ | — |
Capital leases acquired |  | $ | 0.3 |  |  | $ | — |  |  | $ | — |

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