Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 1,260,842	$ 1,294,356
Accounts receivable, less allowance for doubtful accounts of $9,383 in 2012 and $10,381 in 2011	1,031,376	934,752
Deferred Federal and state income taxes	12,102	10,415
Other	53,279	47,360
Total current assets	2,357,599	2,286,883
Property and equipment, net	556,204	538,806
Goodwill	7,927	7,927
Other assets, net	32,395	33,211
Total assets	2,954,125	2,866,827
Current Liabilities:
Accounts payable	641,593	606,628
Accrued expenses, primarily salaries and related costs	178,995	169,445
Federal, state, and foreign income taxes	21,970	20,072
Total current liabilities	842,558	796,145
Deferred Federal and state income taxes	78,997	60,613
Commitments and contingencies
Shareholders' Equity:
Preferred stock, par value $.01 per share, authorized 2,000,000 shares; none issued	0	0
Common stock, par value $.01 per share, authorized 640,000,000 shares; issued and outstanding 206,392,013 shares at December 31, 2012 and 212,003,662 shares at December 31, 2011	2,064	2,120
Additional paid-in capital	1,283	13,260
Retained earnings	2,018,618	1,991,222
Accumulated other comprehensive income (loss)	5,734	(2,964)
Total shareholders' equity	2,027,699	2,003,638
Noncontrolling interest	4,871	6,431
Total equity	2,032,570	2,010,069
Total liabilities and equity	$ 2,954,125	$ 2,866,827