Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 1,364,247	$ 1,294,356
Short-term investments	376	472
Accounts receivable, less allowance for doubtful accounts of $8,731 at June 30, 2012 and $10,381 at December 31, 2011	983,131	934,752
Deferred Federal and state income taxes	10,234	10,415
Other	47,409	46,888
Total current assets	2,405,397	2,286,883
Property and equipment, less accumulated depreciation and amortization of $309,467 at June 30, 2012 and $296,481 at December 31, 2011	546,754	538,806
Goodwill and other intangibles, net	10,003	10,557
Other assets, net	30,218	30,581
Total assets	2,992,372	2,866,827
Current Liabilities:
Accounts payable	672,836	606,628
Accrued expenses, primarily salaries and related costs	184,114	169,445
Federal, state and foreign income taxes	25,948	20,072
Total current liabilities	882,898	796,145
Deferred Federal and state income taxes	59,417	60,613
Commitments and contingencies
Shareholders' Equity:
Preferred stock, none issued	0	0
Common stock, par value $.01 per share. Issued and outstanding 210,503,675 shares at June 30, 2012 and 212,003,662 shares at December 31, 2011	2,105	2,120
Additional paid-in capital	1,013	13,260
Retained earnings	2,044,682	1,991,222
Accumulated other comprehensive loss	(4,345)	(2,964)
Total shareholders' equity	2,043,455	2,003,638
Noncontrolling interest	6,602	6,431
Total equity	2,050,057	2,010,069
Total liabilities and equity	$ 2,992,372	$ 2,866,827