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Earnings Per Share Series A-1 Preferred Stock (Details) (The Carlyle Group [Member], USD $)
Jul. 23, 2012
RailAmerica [Member]
Jul. 17, 2012
RailAmerica [Member]
Feb. 12, 2013
Series A-1 Preferred Stock [Member]
Dec. 31, 2012
Series A-1 Preferred Stock [Member]
RailAmerica [Member]
Oct. 02, 2012
Series A-1 Preferred Stock [Member]
RailAmerica [Member]
Series A-1 Preferred Stock shares issued         350,000
Stated amount per share         $ 1,000.00
Net proceeds from issuance of Series A-1 Preferred Stock         $ 349,400,000
Convertible preferred stock coupon rate   4.50%   5.00%  
Preferred Stock conversion shares 17.1        
Optional Preferred Stock Conversion Rate 130.00%        
Optional Preferred Stock Conversion Price $ 76.03   $ 76.03    
Preferred Stock conversion price   $ 58.49