Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 1,367,642	$ 1,294,356
Accounts receivable, less allowance for doubtful accounts of $9,167 at September 30, 2012 and $10,381 at December 31, 2011	1,015,350	934,752
Deferred Federal and state income taxes	10,955	10,415
Other	46,048	47,360
Total current assets	2,439,995	2,286,883
Property and equipment, less accumulated depreciation and amortization of $317,896 at September 30, 2012 and $296,481 at December 31, 2011	551,610	538,806
Goodwill and other intangibles, net	9,774	10,557
Other assets, net	30,808	30,581
Total assets	3,032,187	2,866,827
Current Liabilities:
Accounts payable	667,395	606,628
Accrued expenses, primarily salaries and related costs	174,862	169,445
Federal, state and foreign income taxes	23,943	20,072
Total current liabilities	866,200	796,145
Deferred Federal and state income taxes	70,288	60,613
Commitments and contingencies
Shareholders' Equity:
Preferred stock, none issued	0	0
Common stock, par value $.01 per share. Issued and outstanding 208,950,205 shares at September 30, 2012 and 212,003,662 shares at December 31, 2011	2,090	2,120
Additional paid-in capital	118	13,260
Retained earnings	2,082,542	1,991,222
Accumulated other comprehensive income (loss)	5,267	(2,964)
Total shareholders' equity	2,090,017	2,003,638
Noncontrolling interest	5,682	6,431
Total equity	2,095,699	2,010,069
Total liabilities and equity	$ 3,032,187	$ 2,866,827