Information by Segment, Geography, and Customer Concentration (Tables)

12 Months Ended

Dec. 31, 2020

Segment Reporting [Abstract]

Summary Of Financial Information By Segments

The following tables present the Company's financial information by segment:

	2020				2019				2018 (recast)
Total revenue:	(Dollars in thousands)
Trucking	$	3,786,030	81.0	%	$	3,952,866	81.6	%	$	4,290,254	80.3	%
Logistics	$	375,841	8.0	%	$	352,988	7.3	%	$	436,044	8.2	%
Intermodal	$	391,462	8.4	%	$	455,466	9.4	%	$	498,821	9.3	%
Subtotal	$	4,553,333	97.4	%	$	4,761,320	98.3	%	$	5,225,119	97.8	%
Non-reportable segments	$	188,882	4.0	%	$	130,782	2.7	%	$	184,140	3.4	%
Intersegment eliminations	$	(68,352)	(1.4	%)	$	(48,152)	(1.0	%)	$	(65,193)	(1.2	%)
Total revenue	$	4,673,863	100.0	%	$	4,843,950	100.0	%	$	5,344,066	100.0	%

	2020				2019				2018 (recast)
Operating income (loss):	(Dollars in thousands)
Trucking	$	578,512	102.5	%	$	468,749	109.7	%	$	550,818	96.8	%
Logistics	$	20,245	3.6	%	$	21,869	5.1	%	$	31,991	5.6	%
Intermodal	$	(943)	(0.2	%)	$	4,501	1.1	%	$	31,272	5.5	%
Subtotal	$	597,814	105.9	%	$	495,119	115.9	%	$	614,081	107.9	%
Non-reportable segments	$	(33,376)	(5.9	%)	$	(67,681)	(15.9	%)	$	(45,038)	(7.9	%)
Operating income	$	564,438	100.0	%	$	427,438	100.0	%	$	569,043	100.0	%

	2020				2019				2018 (recast)
Depreciation and amortization of property and equipment:	(Dollars in thousands)
Trucking	$	390,417	84.7	%	$	355,270	84.6	%	$	319,210	82.4	%
Logistics	$	829	0.2	%	$	728	0.2	%	$	607	0.2	%
Intermodal	$	14,377	3.1	%	$	13,506	3.2	%	$	12,044	3.1	%
Subtotal	$	405,623	88.0	%	$	369,504	88.0	%	$	331,861	85.7	%
Non-reportable segments	$	55,152	12.0	%	$	50,578	12.0	%	$	55,644	14.3	%
Consolidated depreciation and amortization of property and equipment	$	460,775	100.0	%	$	420,082	100.0	%	$	387,505	100.0	%