CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 333,890	$ 247,666
Receivables, net of allowance for doubtful accounts of $42,409 and $39,543	2,113,930	1,711,191
Prepaid expenses and other	63,116	49,245
Total current assets	2,510,936	2,008,102
Property and equipment	497,909	450,045
Accumulated depreciation and amortization	(267,583)	(217,092)
Net property and equipment	230,326	232,953
Goodwill	1,275,816	1,232,796
Other intangible assets, net of accumulated amortization of $122,283 and $87,486	151,585	167,525
Deferred tax assets	6,870	2,250
Other assets	60,301	44,132
Total assets	4,235,834	3,687,758
Current liabilities:
Accounts payable	1,000,305	839,736
Outstanding checks	96,359	82,052
Accrued expenses–
Compensation	105,316	98,107
Income taxes	12,240	15,472
Other accrued liabilities	58,229	70,351
Current portion of debt	715,000	740,000
Total current liabilities	1,987,449	1,845,718
Long-term debt	750,000	500,000
Noncurrent income taxes payable	26,684	18,849
Deferred tax liabilities	45,355	65,122
Other long-term liabilities	601	222
Total liabilities	2,810,089	2,429,911
Commitments and contingencies
Stockholders’ investment:
Preferred stock, $.10 par value, 20,000 shares authorized; no shares issued or outstanding	0	0
Common stock, $.10 par value, 480,000 shares authorized; 179,103 and 179,006 shares issued, 139,542 and 141,258 outstanding	13,954	14,126
Additional paid-in capital	444,280	419,280
Retained earnings	3,437,093	3,190,578
Accumulated other comprehensive loss	(18,460)	(61,442)
Treasury stock at cost (39,561 and 37,748 shares)	(2,451,122)	(2,304,695)
Total stockholders’ investment	1,425,745	1,257,847
Total liabilities and stockholders’ investment	$ 4,235,834	$ 3,687,758