GOODWILL AND INTANGIBLE ASSETS (Intangible) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Finite-lived intangible assets
Weighted Average Amortization Period			13 years
Cost	$ 64,793		$ 64,793		$ 56,453
Accumulated Amortization	17,847		17,847		14,788
Net Value	46,946		46,946		41,665
Indefinite-lived intangible assets
Net Value	35,122		35,122		35,122
Total intangible assets
Cost	99,915		99,915		91,575
Net Value	82,068		82,068		76,787
Amortization expense on intangible assets
Intangible amortization expense	1,100	$ 900	3,059	$ 3,079
Minimum
Amortization expense on intangible assets
Approximate annual amortization expense on intangible assets expected for years 2016 - 2020			4,300
Maximum
Amortization expense on intangible assets
Approximate annual amortization expense on intangible assets expected for years 2016 - 2020			4,900
Trade name
Indefinite-lived intangible assets
Net Value	32,300		32,300		32,300
Other
Indefinite-lived intangible assets
Net Value	2,822		$ 2,822		2,822
Customer relationships
Finite-lived intangible assets
Weighted Average Amortization Period			14 years
Cost	60,021		$ 60,021		52,221
Accumulated Amortization	14,248		14,248		11,331
Net Value	45,773		45,773		40,890
Customer relationships | Transportation Management (ABF Logistics) | LDS
Finite-lived intangible assets
Cost	7,300		$ 7,300
Driver network
Finite-lived intangible assets
Weighted Average Amortization Period			3 years
Cost	3,200		$ 3,200		3,200
Accumulated Amortization	3,200		$ 3,200		3,200
Other
Finite-lived intangible assets
Weighted Average Amortization Period			6 years
Cost	1,572		$ 1,572		1,032
Accumulated Amortization	399		399		257
Net Value	$ 1,173		$ 1,173		$ 775