Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011	Dec. 31, 2010
Current assets
Cash and cash equivalents	$ 169,809	$ 119,385
Accounts receivable, net	265,598	233,706
Prepaids and other current assets	40,068	38,486
Deferred tax assets, net	20,180	8,770
Income tax receivable	28,839	23,869
Total current assets	524,494	424,216
Long-term assets
Property, plant and equipment, net	92,379	105,528
Goodwill	73,990	52,707
Contract acquisition costs, net	2,072	2,782
Deferred tax assets, net	33,729	37,944
Other long-term assets	56,465	37,446
Total long-term assets	258,635	236,407
Total assets	783,129	660,623
Current liabilities
Accounts payable	21,401	23,599
Accrued employee compensation and benefits	73,008	72,406
Other accrued expenses	27,755	40,682
Income taxes payable	8,416	23,175
Deferred tax liabilities, net	1,712	2,235
Deferred revenue	16,063	5,570
Other current liabilities	9,181	4,584
Total current liabilities	157,536	172,251
Long-term liabilities
Line of credit	130,300	0
Negative investment in deconsolidated subsidiary	76	76
Deferred tax liabilities, net	3,294	3,559
Deferred rent	7,243	10,363
Other long-term liabilities	29,949	19,556
Total long-term liabilities	170,862	33,554
Total liabilities	328,398	205,805
Commitments and contingencies (Note 10)	0	0
Stockholders' equity
Preferred stock - $0.01 par value: 10,000,000 shares authorized; zero shares outstanding as of September 30, 2011 and December 31, 2010	0	0
Common stock - $0.01 par value; 150,000,000 shares authorized; 56,336,610 and 57,875,269 shares outstanding as of September 30, 2011 and December 31, 2010, respectively	563	579
Additional paid-in capital	348,519	349,157
Treasury stock at cost: 25,715,643 and 24,179,176 shares as of September 30, 2011 and December 31, 2010, respectively	(360,815)	(322,946)
Accumulated other comprehensive income	888	20,334
Retained earnings	454,663	396,602
Noncontrolling interest	10,913	11,092
Total stockholders' equity	454,731	454,818
Total liabilities and stockholders' equity	$ 783,129	$ 660,623