Environmental	9 Months Ended
Sep. 30, 2011
Environmental [Abstract]
Environmental	NOTE 9: Environmental Consistent with our accounting policy for environmental remediation costs, we expensed $0.7 million and $1.5 million for the three months ended September 30, 2011 and 2010, respectively, and $0.6 million and $1.5 million for the nine months ended September 30, 2011 and 2010, respectively, for environmental remediation obligations. The accrued environmental liability reflected in our consolidated balance sheets was $30.3 million and $26.2 million at September 30, 2011 and December 31, 2010, respectively, of which $22.1 million and $20.4 million, respectively, were classified as other long-term liabilities. These amounts include $7.3 million in environmental liabilities we assumed upon our merger with Frontier of which $4.9 million is classified as other long-term liabilities at September 30, 2011. This includes estimated costs of future expenditures for environmental remediation that are expected to be incurred over the next several years that are not discounted to their present value.

Environmental

9 Months Ended

Sep. 30, 2011

NOTE 9: Environmental

Consistent with our accounting policy for environmental remediation costs, we expensed $0.7 million and $1.5 million for the three months ended September 30, 2011 and 2010, respectively, and $0.6 million and $1.5 million for the nine months ended September 30, 2011 and 2010, respectively, for environmental remediation obligations. The accrued environmental liability reflected in our consolidated balance sheets was $30.3 million and $26.2 million at September 30, 2011 and December 31, 2010, respectively, of which $22.1 million and $20.4

million, respectively, were classified as other long-term liabilities. These amounts include $7.3 million in environmental liabilities we assumed upon our merger with Frontier of which $4.9 million is classified as other long-term liabilities at September 30, 2011. This includes estimated costs of future expenditures for environmental remediation that are expected to be incurred over the next several years that are not discounted to their present value.