OPERATING SEGMENT DATA (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
OPERATING REVENUES
Operating revenues	$ 576,899	$ 510,543	$ 1,097,586	$ 951,410
OPERATING EXPENSES AND COSTS
Gain on sale of property and equipment			(391)	(516)
Operating expenses and costs	568,482	503,342	1,112,520	967,196
OPERATING INCOME (LOSS)
Operating income (loss)	8,417	7,201	(14,934)	(15,786)
OTHER INCOME (EXPENSE)
Interest and dividend income	161	215	332	469
Interest expense and other related financing costs	(1,079)	(1,112)	(2,286)	(2,255)
Other, net	366	(220)	1,450	1,120
Other income (expense), net	(552)	(1,117)	(504)	(666)
INCOME (LOSS) BEFORE INCOME TAXES	7,865	6,084	(15,438)	(16,452)
Freight Transportation
OPERATING REVENUES
Operating revenues	446,750	440,351	854,031	836,864
OPERATING EXPENSES AND COSTS
Salaries, wages, and benefits	272,641	268,995	539,819	534,057
Fuel, supplies, and expenses	82,441	82,696	165,773	163,336
Operating taxes and licenses	10,939	10,823	21,929	21,624
Insurance	6,068	5,585	10,552	10,466
Communications and utilities	3,879	3,459	7,812	7,258
Depreciation and amortization	18,967	19,464	38,541	38,037
Rents and purchased transportation	44,260	39,681	82,729	72,897
Gain on sale of property and equipment	(182)	(231)	(394)	(513)
Other	2,240	2,258	4,322	3,940
Operating expenses and costs	441,253	432,730	871,083	851,102
OPERATING INCOME (LOSS)
Operating income (loss)	5,497	7,621	(17,052)	(14,238)
Premium Logistics and Expedited Freight Services
OPERATING REVENUES
Operating revenues	60,431	10,835	113,683	10,835
OPERATING EXPENSES AND COSTS
Purchased transportation	46,233	8,247	87,270	8,247
Depreciation and amortization	2,594	473	5,144	473
Other	10,098	1,635	20,627	1,635
Operating expenses and costs	58,925	10,355	113,041	10,355
OPERATING INCOME (LOSS)
Operating income (loss)	1,506	480	642	480
Truck Brokerage and Management
OPERATING REVENUES
Operating revenues	16,335	10,021	30,939	18,060
OPERATING EXPENSES AND COSTS
Operating expenses and costs	15,643	9,366	29,480	17,011
OPERATING INCOME (LOSS)
Operating income (loss)	692	655	1,459	1,049
Emergency and Preventative Maintenance
OPERATING REVENUES
Operating revenues	32,935	30,101	65,457	52,479
OPERATING EXPENSES AND COSTS
Operating expenses and costs	32,125	29,407	63,935	51,921
OPERATING INCOME (LOSS)
Operating income (loss)	810	694	1,522	558
Household Goods Moving Services
OPERATING REVENUES
Operating revenues	21,252	20,479	34,828	35,531
OPERATING EXPENSES AND COSTS
Operating expenses and costs	20,304	20,314	34,111	36,157
OPERATING INCOME (LOSS)
Operating income (loss)	948	165	717	(626)
Other and eliminations
OPERATING REVENUES
Operating revenues	(804)	(1,244)	(1,352)	(2,359)
OPERATING EXPENSES AND COSTS
Operating expenses and costs	232	1,170	870	650
OPERATING INCOME (LOSS)
Operating income (loss)	$ (1,036)	$ (2,414)	$ (2,222)	$ (3,009)