CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 174,066	$ 169,207
Accounts receivable, net of allowance of $1,936 and $1,800 respectively	89,932	95,431
Unbilled revenues	58,791	43,108
Prepaid and other current assets	15,111	14,355
Employee loans, net of allowance of $0 and $0, respectively, current	2,114	1,989
Time deposits	6,884	1,188
Short-term security deposits under customer contracts	0	298
Deferred tax assets, current	5,366	5,392
Total current assets	352,264	330,968
Property and equipment, net	53,072	53,315
Long-term deposits under employee loan programs	216	225
Employee loans, net of allowance of $0 and $0, respectively, long-term	4,234	4,401
Intangible assets, net	12,957	13,734
Goodwill	26,392	22,268
Deferred tax assets, long-term	4,705	4,557
Other long-term assets	4,797	3,409
Total assets	458,637	432,877
Current liabilities
Accounts payable	11,812	2,835
Accrued expenses and other liabilities	15,314	20,175
Deferred revenue, current	4,539	4,543
Due to employees	17,305	12,665
Taxes payable	10,413	14,171
Deferred tax liabilities, current	1,072	275
Total current liabilities	60,455	54,664
Deferred revenue, long-term	340	533
Taxes payable, long-term	1,228	1,228
Deferred tax liabilities, long-term	334	351
Total liabilities	62,357	56,776
Commitments and contingencies (See Note 10)
Stockholders' equity
Common stock, $0.001 par value; 160,000,000 authorized; 47,893,055 and 47,569,463 shares issued, 46,940,797 and 46,614,916 shares outstanding at March 31, 2014 and December 31, 2013, respectively	47	46
Additional paid-in capital	201,955	195,585
Retained earnings	208,350	190,986
Treasury stock	(8,663)	(8,684)
Accumulated other comprehensive loss	(5,409)	(1,832)
Total stockholders' equity	396,280	376,101
Total liabilities and stockholders' equity	$ 458,637	$ 432,877