Note 2. Goodwill and Intangible Assets Goodwill rollforward (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]
Goodwill, gross	$ 521,004	$ 521,020	$ 521,213
Accumulated impairment loss	(183,049)	(183,049)	(183,049)
Goodwill, net	337,955	337,971	338,164
Change in foreign currency exchange rates	(16)	(193)
Logistics [Member]
Goodwill [Line Items]
Goodwill, gross	55,679	55,695	55,888
Accumulated impairment loss	(48,236)	(48,236)	(48,236)
Goodwill, net	7,443	7,459	7,652
Change in foreign currency exchange rates	(16)	(193)
Truckload [Member]
Goodwill [Line Items]
Goodwill, gross	464,598	464,598	464,598
Accumulated impairment loss	(134,813)	(134,813)	(134,813)
Goodwill, net	329,785	329,785	329,785
Change in foreign currency exchange rates	0	0
Corporate and Eliminations [Member]
Goodwill [Line Items]
Goodwill, gross	727	727	727
Accumulated impairment loss	0	0	0
Goodwill, net	727	727	727
Change in foreign currency exchange rates	$ 0	$ 0