Consolidated Balance Sheets (USD $)	Dec. 31, 2011	Dec. 31, 2010
Current assets
Cash and cash equivalents	$ 156,371	$ 119,385
Accounts receivable, net	243,636	233,706
Prepaids and other current assets	37,434	38,486
Deferred tax assets, net	22,994	8,770
Income tax receivable	17,847	23,869
Total current assets	478,282	424,216
Long-term assets
Property, plant and equipment, net	100,321	105,528
Goodwill	70,844	52,707
Contract acquisition costs, net	2,866	2,782
Deferred tax assets, net	32,512	37,944
Other long-term assets	62,153	37,446
Total long-term assets	268,696	236,407
Total assets	746,978	660,623
Current liabilities
Accounts payable	27,555	23,599
Accrued employee compensation and benefits	71,500	72,406
Other accrued expenses	33,816	40,682
Income tax payable	10,051	23,175
Deferred tax liabilities, net	912	2,235
Deferred revenue	15,895	5,570
Other current liabilities	10,282	4,584
Total current liabilities	170,011	172,251
Long-term liabilities
Line of credit	64,000	0
Negative investment in deconsolidated subsidiary	76	76
Deferred tax liabilities, net	3,020	3,559
Deferred rent	6,729	10,363
Other long-term liabilities	32,895	19,556
Total long-term liabilities	106,720	33,554
Total liabilities	276,731	205,805
Commitments and contingencies (Note 15)	0	0
Stockholders' equity
Preferred stock - $0.01 par value: 10,000,000 shares authorized; zero shares outstanding as of December 31, 2011 and December 31, 2010	0	0
Common stock - $0.01 par value; 150,000,000 shares authorized; 56,635,319 and 57,875,269 shares outstanding as of December 31, 2011 and December 31, 2010, respectively	566	579
Additional paid-in capital	350,386	349,157
Treasury stock at cost: 25,416,934 and 24,179,176 shares as of December 31, 2011 and December 31, 2010, respectively	(357,267)	(322,946)
Accumulated other comprehensive income (loss)	(5,474)	20,334
Retained earnings	470,776	396,602
Noncontrolling interest	11,260	11,092
Total stockholders' equity	470,247	454,818
Total liabilities and stockholders' equity	$ 746,978	$ 660,623