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Changes in Operations Freightliner Pro Forma (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
$ / shares
$ / £
Mar. 31, 2015
$ / £
Mar. 25, 2015
$ / £
Sep. 30, 2014
$ / £
Jun. 30, 2014
$ / £
Mar. 31, 2014
$ / £
Foreign Currency Exchange Rate, Translation | $ / £   1.58 1.51 1.49 1.67 1.68 1.66
Freightliner [Member]              
Operating revenues $ 2,157,020 $ 2,417,709          
Net income $ 248,922 $ 316,459          
Basic earnings per common share | $ / shares $ 4.39 $ 5.72          
Diluted earnings per common share | $ / shares $ 4.30 $ 5.55          
Acquisition-related Costs [Member] | Pro Forma [Member] | Freightliner [Member]              
Net income $ (9,500) $ (9,500)          
Business Acquisition, Pro Forma Net Income (Loss) Before Tax (12,600) (12,600)          
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Member] | Pro Forma [Member] | Freightliner [Member]              
Net income (11,600)            
Business Acquisition, Pro Forma Net Income (Loss) Before Tax (18,700)            
Freightliner [Member] | Acquisition-related Costs [Member] | Pro Forma [Member]              
Net income (9,100) (11,900)          
Business Acquisition, Pro Forma Net Income (Loss) Before Tax $ (12,200) (15,900)          
Freightliner [Member] | Gain on Disposal of Lease Rights [Domain] | Pro Forma [Member]              
Net income   48,800          
Business Acquisition, Pro Forma Net Income (Loss) Before Tax   $ 53,700