Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 384,424	$ 378,615
Receivables, net of allowance for doubtful accounts of $34,057 and $41,131	2,074,449	2,162,438
Contract assets	150,569	159,635
Prepaid expenses and other	73,724	52,386
Total current assets	2,683,166	2,753,074
Property and equipment, net	209,521	228,301
Goodwill	1,285,891	1,258,922
Other intangible assets, net	98,683	108,822
Right-of-use lease assets	263,833
Deferred tax assets	11,563	9,993
Other assets	83,892	68,300
Total assets	4,636,549	4,427,412
Current liabilities:
Accounts payable	1,019,280	971,023
Outstanding checks	57,317	92,084
Accrued expenses:
Compensation	107,659	153,626
Transportation expense	114,498	119,820
Income taxes	19,470	28,360
Other accrued liabilities	60,069	63,410
Current lease liabilities	55,847
Current portion of debt	0	5,000
Total current liabilities	1,434,140	1,433,323
Long-term debt	1,253,091	1,341,352
Noncurrent lease liabilities	216,610
Noncurrent income taxes payable	22,149	21,463
Deferred tax liabilities	37,206	35,757
Other long-term liabilities	257	430
Total liabilities	2,963,453	2,832,325
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; 179,429 and 179,400 shares issued, 135,152 and 137,284 outstanding	13,515	13,728
Additional paid-in capital	549,378	521,486
Retained earnings	4,115,649	3,845,593
Accumulated other comprehensive loss	(90,902)	(71,935)
Treasury stock at cost (44,277 and 42,116 shares)	(2,914,544)	(2,713,785)
Total stockholders’ investment	1,673,096	1,595,087
Total liabilities and stockholders’ investment	$ 4,636,549	$ 4,427,412