Segment Information (Tables)

12 Months Ended

Dec. 31, 2011

Segment Information [Abstract]

Information Regarding Reportable Business Segments

	Transportation Logistics		Insurance		Total
2011
External revenue	$	2,614,739	$	34,343	$	2,649,082
Internal revenue				27,544		27,544
Investment income				1,705		1,705
Interest and debt expense		3,112				3,112
Depreciation and amortization		25,814				25,814
Operating income		156,354		26,891		183,245
Expenditures on long-lived assets		4,337				4,337
Goodwill		57,470				57,470
Capital lease additions		34,044				34,044
Total assets		647,002		161,447		808,449
2010
External revenue	$	2,366,032	$	34,138	$	2,400,170
Internal revenue				27,535		27,535
Investment income				1,558		1,558
Interest and debt expense		3,623				3,623
Depreciation and amortization		24,804				24,804
Operating income		116,512		23,459		139,971
Expenditures on long-lived assets		27,505				27,505
Goodwill		57,470				57,470
Capital lease additions		14,986				14,986
Total assets		576,334		107,548		683,882
2009
External revenue	$	1,972,863	$	35,933	$	2,008,796
Internal revenue				27,179		27,179
Investment income				1,268		1,268
Interest and debt expense		4,030				4,030
Depreciation and amortization		23,528				23,528
Operating income		88,176		25,566		113,742
Expenditures on long-lived assets		2,715				2,715
Goodwill		57,470				57,470
Capital lease additions		12,284				12,284
Total assets		524,584		124,208		648,792