CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 310,575	$ 333,890
Receivables, net of allowance for doubtful accounts of $39,399 and $42,409	2,202,460	2,113,930
Contract assets	182,247	0
Prepaid expenses and other	63,374	63,116
Total current assets	2,758,656	2,510,936
Property and equipment, net	228,325	230,326
Goodwill	1,265,778	1,275,816
Other intangible assets, net	130,254	151,585
Deferred tax asset	10,714	6,870
Other assets	59,557	60,301
Total assets	4,453,284	4,235,834
Current liabilities:
Accounts payable	1,059,669	1,000,305
Outstanding checks	74,168	96,359
Accrued expenses:
Transportation expense	140,231	0
Compensation	99,279	105,316
Income taxes	18,393	12,240
Other accrued liabilities	66,987	58,229
Current portion of debt	66,000	715,000
Total current liabilities	1,524,727	1,987,449
Long-term debt	1,341,054	750,000
Noncurrent income taxes payable	25,364	26,684
Deferred tax liabilities	42,779	45,355
Other long-term liabilities	1,201	601
Total liabilities	2,935,125	2,810,089
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; 179,101 and 179,103 shares issued, 138,744 and 139,542 outstanding	13,874	13,954
Additional paid-in capital	478,451	444,280
Retained earnings	3,617,324	3,437,093
Accumulated other comprehensive loss	(46,537)	(18,460)
Treasury stock at cost (40,357 and 39,561 shares)	(2,544,953)	(2,451,122)
Total stockholders’ investment	1,518,159	1,425,745
Total liabilities and stockholders’ investment	$ 4,453,284	$ 4,235,834