CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net service revenues	$ 1,023,684	$ 1,015,444
Direct costs of services, consisting of payroll, payroll taxes, insurance costs and reimbursable expenses	613,394	613,361
Gross margin	410,290	402,083
Selling, general and administrative expenses	320,785	322,018
Amortization of intangible assets	433	35
Interest income, net	(304)	(234)
Income before income taxes	89,376	80,264
Provision for income taxes	33,513	31,930
Net income	55,863	48,334
Net income available to common stockholders-diluted	$ 55,861	$ 48,070
Net income per share (Note J):
Basic	$ 0.41	$ 0.34
Diluted	$ 0.40	$ 0.34
Shares:
Basic	137,311	139,384
Diluted	138,394	140,443
Cash dividends declared per share	$ 0.16	$ 0.15