Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 202,649	$ 243,796
Receivables, net of allowance for credit loss of $37,114 and $38,113	3,721,571	2,449,577
Contract assets, net of allowance for credit loss	416,971	197,176
Prepaid expenses and other	89,472	51,152
Total current assets	4,430,663	2,941,701
Property and equipment, net of accumulated depreciation and amortization	177,418	178,949
Goodwill	1,486,199	1,487,187
Other intangible assets, net of accumulated amortization	96,025	113,910
Right-of-use lease assets	297,249	319,785
Deferred tax assets	26,244	18,640
Other assets	88,808	84,086
Total assets	6,602,606	5,144,258
Current liabilities:
Accounts payable	1,797,441	1,195,099
Outstanding checks	66,748	88,265
Accrued expenses:
Compensation	173,353	138,460
Transportation expense	319,154	153,574
Income taxes	39,276	43,700
Other accrued liabilities	157,251	154,460
Current lease liabilities	66,470	66,174
Current portion of debt	632,000	0
Total current liabilities	3,251,693	1,839,732
Long-term debt	1,093,950	1,093,301
Noncurrent lease liabilities	245,902	268,572
Noncurrent income taxes payable	25,449	26,015
Deferred tax liabilities	20,259	22,182
Other long-term liabilities	14,553	14,523
Total liabilities	4,651,806	3,264,325
Stockholders’ investment:
Preferred stock, $0.10 par value, 20,000 shares authorized; no shares issued or outstanding	0	0
Common stock, $0.10 par value, 480,000 shares authorized; 179,206 and 179,232 shares issued, 130,376 and 134,298 outstanding	13,038	13,430
Additional paid-in capital	637,182	566,022
Retained earnings	4,779,964	4,372,833
Accumulated other comprehensive loss	(65,480)	(45,998)
Treasury stock at cost (48,830 and 44,934 shares)	(3,413,904)	(3,026,354)
Total stockholders’ investment	1,950,800	1,879,933
Total liabilities and stockholders’ investment	$ 6,602,606	$ 5,144,258