Annual report pursuant to Section 13 and 15(d)

Operating Leases (Details)

v2.4.0.8
Operating Leases (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Years
Dec. 31, 2012
Dec. 31, 2011
Operating Leases [Abstract]      
Operating lease renewal option, minimum (in years) 1    
Operating lease renewal option, maximum (in years) 10    
Operating lease original term, for tractors, trucks and trailers, minimum (in years) 3 years    
Operating lease original term, for tractors, trucks and trailers, maximum (in years) 6 years    
Sublease rental income $ 914 $ 813 $ 770
Expected future sublease rental income 205    
Operating Leases, Future Minimum Payments Due [Abstract]      
2014 21,420    
2015 18,014    
2016 13,377    
2017 8,474    
2018 5,316    
Thereafter 2,598    
Total $ 69,199