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Intangbile assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Jan. 02, 2016
Intangible Assets [Line Items]    
Indefinite Lived Intangible Assets $ 51,687 $ 52,466
Finite Lived Intangible Assets: 961,427 982,602
Accumulated Amortization: (301,187) (252,719)
Total Intangible assets, less accumulated amortization 711,927 782,349
Trade Names [Member]    
Intangible Assets [Line Items]    
Indefinite Lived Intangible Assets 51,687 52,466
Routes [Member]    
Intangible Assets [Line Items]    
Finite Lived Intangible Assets: 374,989 390,888
Accumulated Amortization: (105,934) (99,819)
Permits [Member]    
Intangible Assets [Line Items]    
Finite Lived Intangible Assets: 493,311 494,754
Accumulated Amortization: (170,165) (134,752)
Non-compete agreements [Member]    
Intangible Assets [Line Items]    
Finite Lived Intangible Assets: 3,638 6,996
Accumulated Amortization: (1,788) (4,628)
Trade Names [Member]    
Intangible Assets [Line Items]    
Finite Lived Intangible Assets: 76,033 75,825
Accumulated Amortization: (21,042) (11,959)
Royalty, consulting land use and leasehold [Member]    
Intangible Assets [Line Items]    
Finite Lived Intangible Assets: 13,456 14,139
Accumulated Amortization: $ (2,258) $ (1,561)