Business Segments (Tables)

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Summary of Operating Results

The following is a summary of operating results for our business segments for the years ended December 31, 2017, 2016 and 2015 (in thousands):

	Twelve Months									Twelve Months
	Ended December  31, 2017									Ended December  31, 2016
					Inter-			Hub						Inter-			Hub
					Segment			Group						Segment			Group
	Hub		Mode		Elims			Total		Hub		Mode		Elims			Total
Revenue	$	3,107,394	$	1,029,160	$	(101,657	)	$	4,034,897	$	2,734,541	$	948,735	$	(110,486	)	$	3,572,790
Transportation costs		2,771,291		907,746		(101,657	)		3,577,380		2,404,946		823,545		(110,486	)		3,118,005
Gross margin		336,103		121,414		-			457,517		329,595		125,190		-			454,785
Costs and expenses:
Salaries and benefits		174,573		13,816		-			188,389		165,136		15,323		-			180,459
Agent fees and commissions		58		74,024		-			74,082		66		72,830		-			72,896
General and administrative		77,085		8,097		-			85,182		60,811		7,819		-			68,630
Depreciation and amortization		12,139		1,174		-			13,313		7,698		1,268		-			8,966
Total costs and expenses		263,855		97,111		-			360,966		233,711		97,240		-			330,951
Operating income	$	72,248	$	24,303	$	-		$	96,551		95,884		27,950		-			123,834
Capital expenditures	$	73,772	$	769	$	-		$	74,541	$	106,316	$	1,093	$	-		$	107,409

	Twelve Months
	Ended December  31, 2015
					Inter-			Hub
					Segment			Group
	Hub		Mode		Elims			Total
Revenue	$	2,679,318	$	928,661	$	(82,384	)	$	3,525,595
Transportation costs		2,385,197		810,087		(82,384	)		3,112,900
Gross margin		294,121		118,574		-			412,695
Costs and expenses:
Salaries and benefits		143,993		14,945		-			158,938
Agent fees and commissions		56		68,668		-			68,724
General and administrative		53,023		6,992		-			60,015
Depreciation and amortization		6,688		1,300		-			7,988
Total costs and expenses		203,760		91,905		-			295,665
Operating income	$	90,361	$	26,669	$	-		$	117,030
Capital expenditures	$	79,860	$	3,182	$	-		$	83,042

Schedule of Assets

	As of December 31, 2017									As of December 31, 2016
					Inter-			Hub						Inter-			Hub
					Segment			Group						Segment			Group
	Hub		Mode		Elims			Total		Hub		Mode		Elims			Total
Total assets	$	1,470,792	$	210,088	$	(9,939	)	$	1,670,941	$	1,178,110	$	191,374	$	(9,225	)	$	1,360,259
Goodwill	$	319,272	$	29,389	$	-			348,661	$	232,987	$	29,389	$	-			262,376

Summary of Revenue by Segment and Business Line

The following tables summarize our revenue by segment and business line (in thousands):

	Twelve Months									Twelve Months
	Ended December  31, 2017									Ended December  31, 2016
					Inter-			Hub						Inter-			Hub
					Segment			Group						Segment			Group
	Hub		Mode		Elims			Total		Hub		Mode		Elims			Total
Intermodal	$	1,852,884	$	496,733	$	(56,587	)	$	2,293,030	$	1,785,865	$	486,758	$	(81,556	)	$	2,191,067
Truck brokerage		483,955		340,330		(1,990	)		822,295		391,901		308,055		(1,456	)		698,500
Logistics		655,543		192,097		(43,061	)		804,579		556,775		153,922		(27,474	)		683,223
Dedicated		115,012		-		(19	)		114,993		-		-		-			-
Total revenue	$	3,107,394	$	1,029,160	$	(101,657	)	$	4,034,897	$	2,734,541	$	948,735	$	(110,486	)	$	3,572,790

	Twelve Months
	Ended December  31, 2015
					Inter-			Hub
					Segment			Group
	Hub		Mode		Elims			Total
Intermodal	$	1,792,046	$	483,910	$	(78,688	)	$	2,197,268
Truck brokerage		355,402		314,498		(1,908	)		667,992
Logistics		531,870		130,253		(1,788	)		660,335
Total revenue	$	2,679,318	$	928,661	$	(82,384	)	$	3,525,595