Income Taxes	3 Months Ended
Mar. 31, 2013
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES: Included in the Company's net income for the three months ended March 31, 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 tax was $16.0 million and $12.3 million for the three months ended March 31, 2013 and 2012, respectively, which represented 27.7% and 35.6%, respectively, of income from continuing operations other than the retroactive benefit recorded in the three months ended March 31, 2013. The decrease in the effective income tax rate for the three months ended March 31, 2013 was primarily attributable to the renewal of the United States Short Line Tax Credit through December 31, 2013. The United States track maintenance credit is an income tax 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

3 Months Ended

Mar. 31, 2013

INCOME TAXES:

Included in the Company's net income for the three months ended March 31, 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 tax was $16.0 million and $12.3 million for the three months ended March 31, 2013 and 2012, respectively, which represented 27.7% and 35.6%, respectively, of income from continuing operations other than the retroactive benefit recorded in the three months ended March 31, 2013. The decrease in the effective income tax rate for the three months ended March 31, 2013 was primarily attributable to the renewal of the United States Short Line Tax Credit through December 31, 2013.

The United States track maintenance credit is an income tax 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.