CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 378,615	$ 333,890
Receivables, net of allowance for doubtful accounts of $41,131 and $42,409	2,162,438	2,113,930
Contract assets	159,635	0
Prepaid expenses and other	52,386	63,116
Total current assets	2,753,074	2,510,936
Property and equipment	498,847	497,909
Accumulated depreciation and amortization	(270,546)	(267,583)
Net property and equipment	228,301	230,326
Goodwill	1,258,922	1,275,816
Other intangible assets, net of accumulated amortization of $156,246 and $122,283	108,822	151,585
Deferred tax assets	9,993	6,870
Other assets	68,300	60,301
Total assets	4,427,412	4,235,834
Current liabilities:
Accounts payable	971,023	1,000,305
Outstanding checks	92,084	96,359
Accrued expenses–
Compensation	153,626	105,316
Transportation expense	119,820	0
Income taxes	28,360	12,240
Other accrued liabilities	63,410	58,229
Current portion of debt	5,000	715,000
Total current liabilities	1,433,323	1,987,449
Long-term debt	1,341,352	750,000
Noncurrent income taxes payable	21,463	26,684
Deferred tax liabilities	35,757	45,355
Other long-term liabilities	430	601
Total liabilities	2,832,325	2,810,089
Commitments and contingencies
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; 179,400 and 179,103 shares issued, 137,284 and 139,542 outstanding	13,728	13,954
Additional paid-in capital	521,486	444,280
Retained earnings	3,845,593	3,437,093
Accumulated other comprehensive loss	(71,935)	(18,460)
Treasury stock at cost (42,116 and 39,561 shares)	(2,713,785)	(2,451,122)
Total stockholders’ investment	1,595,087	1,425,745
Total liabilities and stockholders’ investment	$ 4,427,412	$ 4,235,834