Income Taxes	9 Months Ended
Sep. 30, 2013
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES: The Company's effective income tax rate in the three months ended September 30, 2013 was 25.1%. Included in the Company's net income for the nine months ended September 30, 2013 was a $41.0 million benefit associated with the retroactive extension of the United States Short Line Tax Credit for fiscal year 2012, which was signed into law on January 2, 2013. The Company's provision for income taxes was $63.5 million for the nine months ended September 30, 2013, which represented 26.8% of income from continuing operations other than the retroactive benefit. Included in the Company's income/(loss) from continuing operations before income taxes for the three and nine months ended September 30, 2012 was a $50.1 million mark-to-market expense associated with a contingent forward sale contract, which is a non-deductible expense for income tax purposes. See Note 5, Derivative Financial Instruments, for further details on the contingent forward sale contract. As a result, the Company's provision for income taxes was $15.3 million and $46.1 million for the three and nine months ended September 30, 2012, respectively, which represented 33.4% and 34.1%, respectively, of income from continuing operations other than the mark-to-market expense. The decrease in the effective income tax rate for the three and nine months ended September 30, 2013 as compared with the three and nine months ended September 30, 2012 was primarily attributable to the renewal of the United States Short Line Tax Credit through December 31, 2013. The United States Short Line Tax Credit is an income tax track maintenance credit for Class II and Class III railroads to reduce their federal income tax based on qualified railroad track maintenance expenditures (the Short Line Tax Credit). Qualified expenditures include amounts incurred for maintaining track, including roadbed, bridges and related track structures owned or leased by a Class II or Class III railroad. The credit is equal to 50% of the qualified expenditures, subject to an annual limitation of $3,500 multiplied by the number of miles of railroad track owned or leased by the Class II or Class III railroad as of the end of their tax year. The Short Line Tax Credit was in existence from 2005 through 2011. On January 2, 2013, the United States Short Line Tax Credit was extended for 2012 and 2013. The extension of the Short Line Tax Credit produced book income tax benefits of $41.0 million for fiscal year 2012. Since the extension became law in 2013, the 2012 impact was recorded in the first quarter of 2013.

INCOME TAXES:

The Company's effective income tax rate in the three months ended September 30, 2013 was 25.1%. Included in the Company's net income for the nine months ended September 30, 2013 was a $41.0 million benefit associated with the retroactive extension of the United States Short Line Tax Credit for fiscal year 2012, which was signed into law on January 2, 2013. The Company's provision for income taxes was $63.5 million for the nine months ended September 30, 2013, which represented 26.8% of income from continuing operations other than the retroactive benefit. Included in the Company's income/(loss) from continuing operations before income taxes for the three and nine months ended September 30, 2012 was a $50.1 million mark-to-market expense associated with a contingent forward sale contract, which is a non-deductible expense for income tax purposes. See Note 5, Derivative Financial Instruments, for further details on the contingent forward sale contract. As a result, the Company's provision for income taxes was $15.3 million and $46.1 million for the three and nine months ended September 30, 2012, respectively, which represented 33.4% and 34.1%, respectively, of income from continuing operations other than the mark-to-market expense. The decrease in the effective income tax rate for the three and nine months ended September 30, 2013 as compared with the three and nine months ended September 30, 2012 was primarily attributable to the renewal of the United States Short Line Tax Credit through December 31, 2013.

The United States Short Line Tax Credit is an income tax track maintenance credit for Class II and Class III railroads to reduce their federal income tax based on qualified railroad track maintenance expenditures (the Short Line Tax Credit). Qualified expenditures include amounts incurred for maintaining track, including roadbed, bridges and related track structures owned or leased by a Class II or Class III railroad. The credit is equal to 50% of the qualified expenditures, subject to an annual limitation of $3,500 multiplied by the number of miles of railroad track owned or leased by the Class II or Class III railroad as of the end of their tax year. The Short Line Tax Credit was in existence from 2005 through 2011. On January 2, 2013, the United States Short Line Tax Credit was extended for 2012 and 2013. The extension of the Short Line Tax Credit produced book income tax benefits of $41.0 million for fiscal year 2012. Since the extension became law in 2013, the 2012 impact was recorded in the first quarter of 2013.