Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current Assets:
Cash and cash equivalents	$ 1,131,046	$ 1,247,652
Short-term investments	86,491	26,337
Accounts receivable, less allowance for doubtful accounts of $7,208 at March 31, 2014 and $8,695 at December 31, 2013	1,062,924	1,073,500
Deferred Federal and state income taxes	18,248	18,396
Other	36,284	49,384
Total current assets	2,334,993	2,415,269
Property and equipment, less accumulated depreciation and amortization of $356,919 at March 31, 2014 and $348,282 at December 31, 2013	556,071	563,064
Goodwill	7,927	7,927
Other assets, net	26,513	28,552
Total assets	2,925,504	3,014,812
Current Liabilities:
Accounts payable	677,582	648,156
Accrued expenses, primarily salaries and related costs	196,157	200,301
Federal, state and foreign income taxes	27,754	21,743
Total current liabilities	901,493	870,200
Deferred Federal and state income taxes	63,997	58,281
Commitments and contingencies
Shareholders' Equity:
Preferred stock, none issued	0	0
Common stock, par value $.01 per share. Issued and outstanding 197,166,665 shares at March 31, 2014 and 202,553,220 shares at December 31, 2013	1,972	2,025
Additional paid-in capital	728	1,647
Retained earnings	1,964,122	2,087,376
Accumulated other comprehensive loss	(8,691)	(6,265)
Total shareholders’ equity	1,958,131	2,084,783
Noncontrolling interest	1,883	1,548
Total equity	1,960,014	2,086,331
Total liabilities and equity	$ 2,925,504	$ 3,014,812