GOODWILL AND INTANGIBLE ASSETS (Intangible) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite-lived intangible assets
Weighted Average Amortization Period	13 years
Cost	$ 56,453	$ 48,474
Accumulated Amortization	14,788	10,787
Net Value	41,665	37,687
Indefinite-lived intangible assets
Net Value	35,122	35,122
Total intangible assets
Cost	91,575	83,596
Net Value	76,787	72,809
Amortization expense on intangible assets
Intangible amortization expense	4,002	4,352	$ 4,174
Impairment of indefinite-lived intangible assets	0	0
Minimum
Amortization expense on intangible assets
Annual amortization expense on intangible assets expected for future years	4,000
Maximum
Amortization expense on intangible assets
Annual amortization expense on intangible assets expected for future years	4,200
Trade name
Indefinite-lived intangible assets
Net Value	32,300	32,300
Other
Indefinite-lived intangible assets
Net Value	$ 2,822	2,822
Customer relationships
Finite-lived intangible assets
Weighted Average Amortization Period	13 years
Cost	$ 52,221	44,242
Accumulated Amortization	11,331	7,971
Net Value	40,890	36,271
Customer relationships | Transportation Management (ABF Logistics) | Bear Transportation Services, L.P.
Finite-lived intangible assets
Cost	$ 7,300
Driver network
Finite-lived intangible assets
Weighted Average Amortization Period	3 years
Cost	$ 3,200	3,200
Accumulated Amortization	$ 3,200	2,711
Net Value		489
Other
Finite-lived intangible assets
Weighted Average Amortization Period	8 years
Cost	$ 1,032	1,032
Accumulated Amortization	257	105
Net Value	$ 775	$ 927