Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 362,236	$ 447,858
Receivables, net of allowance for credit loss of $34,183 and $32,838	2,018,190	1,974,381
Contract assets, net of allowance for credit loss	154,416	132,874
Prepaid expenses and other	69,084	85,005
Total current assets	2,603,926	2,640,118
Property and equipment, net	188,252	208,423
Goodwill	1,465,755	1,291,760
Other intangible assets, net	126,589	90,931
Right-of-use lease assets	339,495	310,860
Deferred tax assets	14,492	13,485
Other assets	87,180	85,483
Total assets	4,825,689	4,641,060
Current liabilities:
Accounts payable	1,246,675	984,604
Outstanding checks	41,461	78,231
Accrued expenses:
Compensation	125,381	112,784
Transportation expense	121,478	101,194
Income taxes	14,825	12,354
Other accrued liabilities	58,965	62,706
Current lease liabilities	64,595	61,280
Current portion of debt	0	142,885
Total current liabilities	1,673,380	1,556,038
Long-term debt	1,092,873	1,092,448
Noncurrent lease liabilities	280,448	259,444
Noncurrent income taxes payable	22,481	22,354
Deferred tax liabilities	51,921	39,776
Other long-term liabilities	258	270
Total liabilities	3,121,361	2,970,330
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; 179,700 and 179,380 shares issued, 134,724 and 134,895 outstanding	13,472	13,490
Additional paid-in capital	543,608	546,646
Retained earnings	4,227,257	4,144,834
Accumulated other comprehensive loss	(84,091)	(76,149)
Treasury stock at cost (44,976 and 44,485 shares)	(2,995,918)	(2,958,091)
Total stockholders’ investment	1,704,328	1,670,730
Total liabilities and stockholders’ investment	$ 4,825,689	$ 4,641,060