Annual report pursuant to Section 13 and 15(d)

Operating Leases (Details)

v3.3.1.900
Operating Leases (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
Years
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Operating Leased Assets [Line Items]      
Operating lease renewal option, minimum (in years) | Years 1    
Operating lease renewal option, maximum (in years) | 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) 5 years    
Sublease rental income $ 1,611 $ 980 $ 914
Expected future sublease rental income 159    
Operating Leases, Future Minimum Payments Due [Abstract]      
2016 34,817    
2017 27,433    
2018 18,988    
2019 12,211    
2020 6,645    
Thereafter 1,091    
Total $ 101,185