Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current Assets:
Cash and cash equivalents	$ 1,033,144	$ 927,107
Short-term investments	61	40,336
Accounts receivable, less allowance for doubtful accounts of $6,932 at March 31, 2015 and $7,119 at December 31, 2014	1,253,639	1,236,042
Deferred Federal and state income taxes	20,402	20,279
Other	44,914	65,486
Total current assets	2,352,160	2,289,250
Property and equipment, less accumulated depreciation and amortization of $373,011 at March 31, 2015 and $371,756 at December 31, 2014	528,988	538,415
Goodwill	7,927	7,927
Other assets, net	54,703	55,313
Total assets	2,943,778	2,890,905
Current Liabilities:
Accounts payable	749,246	770,238
Accrued expenses, primarily salaries and related costs	203,810	192,468
Federal, state and foreign income taxes	26,163	21,077
Total current liabilities	979,219	983,783
Deferred Federal and state income taxes	37,028	35,514
Commitments and contingencies
Shareholders' Equity:
Preferred stock, none issued	0	0
Common stock, par value $0.01 per share. Issued and outstanding 191,120,214 shares at March 31, 2015 and 191,655,690 shares at December 31, 2014	1,911	1,916
Additional paid-in capital	5,241	1,113
Retained earnings	1,974,830	1,903,196
Accumulated other comprehensive loss	(57,091)	(37,817)
Total shareholders’ equity	1,924,891	1,868,408
Noncontrolling interest	2,640	3,200
Total equity	1,927,531	1,871,608
Total liabilities and equity	$ 2,943,778	$ 2,890,905