CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 107,475	$ 118,112
Accounts receivable, net of allowance of $2,434 and $2,203, respectively	82,817	78,906
Unbilled revenues	57,680	33,414
Prepaid and other current assets	17,167	11,835
Employee loans, net of allowance of $0 and $0, respectively, current	1,417	429
Time deposits	977	1,006
Restricted cash, current	60	660
Deferred tax assets, current	5,876	6,593
Total current assets	273,469	250,955
Property and equipment, net	55,400	53,135
Restricted cash, long-term	353	467
Employee loans, net of allowance of $0 and $0, respectively, long-term	3,408	0
Intangible assets, net	15,115	16,834
Goodwill	22,304	22,698
Deferred tax assets, long-term	3,530	6,093
Other long-term assets	938	632
Total assets	374,517	350,814
Current liabilities
Accounts payable	8,376	6,095
Accrued expenses and other liabilities	7,017	19,814
Deferred revenue, current	4,041	6,369
Due to employees	13,744	12,026
Taxes payable	13,619	14,557
Deferred tax liabilities, current	543	491
Total current liabilities	47,340	59,352
Deferred revenue, long-term	312	1,263
Taxes payable, long-term	1,228	1,228
Deferred tax liabilities, long-term	404	2,691
Total liabilities	49,284	64,534
Commitments and contingencies (Note 10)
Stockholders' equity
Common stock, $.001 par value; 160,000,000 authorized; 46,914,858 and 45,398,523 shares issued, 45,958,829 and 44,442,494 shares outstanding at June 30, 2013 and December 31, 2012, respectively	46	44
Additional paid-in capital	182,503	166,962
Retained earnings	155,790	128,992
Treasury stock	(8,697)	(8,697)
Accumulated other comprehensive loss	(4,409)	(1,021)
Total stockholders' equity	325,233	286,280
Total liabilities and stockholders' equity	$ 374,517	$ 350,814