CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 122,979	$ 118,112
Accounts receivable, net of allowance of $2,592 and $2,203, respectively	87,611	78,906
Unbilled revenues	64,957	33,414
Prepaid and other current assets	22,234	11,835
Employee loans, net of allowance of $0 and $0, respectively, current	1,848	429
Time deposits	0	1,006
Restricted cash, current	217	660
Deferred tax assets, current	5,350	6,593
Total current assets	305,196	250,955
Property and equipment, net	54,062	53,135
Restricted cash, long-term	246	467
Employee loans, net of allowance of $0 and $0, respectively, long-term	4,456	0
Intangible assets, net	14,539	16,834
Goodwill	22,411	22,698
Deferred tax assets, long-term	3,585	6,093
Other long-term assets	969	632
Total assets	405,464	350,814
Current liabilities
Accounts payable	8,195	6,095
Accrued expenses and other liabilities	8,866	19,814
Deferred revenue, current	2,583	6,369
Due to employees	14,530	12,026
Taxes payable	17,364	14,557
Deferred tax liabilities, current	577	491
Total current liabilities	52,115	59,352
Deferred revenue, long-term	155	1,263
Taxes payable, long-term	1,228	1,228
Deferred tax liabilities, long-term	354	2,691
Total liabilities	53,852	64,534
Commitments and contingencies (See Note 10)
Stockholders' equity
Common stock, $0.001 par value; 160,000,000 authorized; 47,329,699 and 45,398,523 shares issued, 46,375,152 and 44,442,494 shares outstanding at September 30, 2013 and December 31, 2012, respectively	46	44
Additional paid-in capital	189,457	166,962
Retained earnings	172,227	128,992
Treasury stock	(8,684)	(8,697)
Accumulated other comprehensive loss	(1,434)	(1,021)
Total stockholders' equity	351,612	286,280
Total liabilities and stockholders' equity	$ 405,464	$ 350,814