CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 14,714us-gaap_NetIncomeLoss	$ 17,364us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,200	3,689
Bad debt expense	514us-gaap_ProvisionForDoubtfulAccounts	368us-gaap_ProvisionForDoubtfulAccounts
Deferred taxes	95us-gaap_DeferredIncomeTaxExpenseBenefit	97us-gaap_DeferredIncomeTaxExpenseBenefit
Stock-based compensation expense	9,134us-gaap_ShareBasedCompensation	3,208us-gaap_ShareBasedCompensation
Excess tax benefit on stock-based compensation plans	(436)	(995)
Other	4,964us-gaap_OtherNoncashIncomeExpense	294us-gaap_OtherNoncashIncomeExpense
(Increase)/ decrease in operating assets:
Accounts receivable	15,262	4,908
Unbilled revenues	(32,261)	(15,611)
Prepaid expenses and other assets	48	939
Increase/ (decrease) in operating liabilities:
Accounts payable	9,669	8,563
Accrued expenses and other liabilities	(10,374)	(7,908)
Deferred revenues	(9)	265
Due to employees	3,224	4,711
Taxes payable	(11,873)	(3,704)
Net cash provided by operating activities	6,871	16,188
Cash flows from investing activities:
Purchases of property and equipment	(1,873)	(2,157)
Payment for construction of corporate facilities	(1,591)	(1,488)
Employee housing loans issued	(266)	(294)
Proceeds from repayments of employee housing loans	518	419
Increase in restricted cash and time deposits, net	(29,959)	(5,387)
Increase in other long-term assets, net	(681)	(350)
Acquisition of businesses, net of cash acquired (Note 2)	(30)	(2,419)
Net cash used in investing activities	(33,882)	(11,676)
Cash flows from financing activities:
Proceeds related to stock options exercises	3,855	2,139
Excess tax benefit on stock-based compensation plans	436	995
Acquisition of business, deferred consideration (Note 2)	(2,801)	0
Net cash provided by financing activities	1,490	3,134
Effect of exchange rate changes on cash and cash equivalents	(2,650)	(2,787)
Net increase/ (decrease) in cash and cash equivalents	(28,171)	4,859
Cash and cash equivalents, beginning of period	220,534	169,207
Cash and cash equivalents, end of period	$ 192,363	$ 174,066

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