CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net income	$ 48,329	$ 33,945
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,225	8,103
Bad debt expense	1,730	701
Deferred taxes	69	372
Stock-based compensation expense	23,694	21,387
Excess tax benefit on stock-based compensation plans	(4,350)	(2,382)
Other	1,003	2,085
(Increase)/decrease in operating assets:
Accounts receivable	(5,466)	(13,209)
Unbilled revenues	1,623	(35,935)
Prepaid expenses and other assets	194	(7,935)
Increase/(decrease) in operating liabilities:
Accounts payable	461	7,743
Accrued expenses and other liabilities	(31,982)	(4,160)
Deferred revenues	67	(459)
Due to employees	6,597	3,602
Taxes payable	(3,840)	(4,824)
Net cash provided by operating activities	49,354	9,034
Cash flows from investing activities:
Purchases of property and equipment	(13,589)	(5,342)
Payment for construction of corporate facilities	0	(3,512)
Employee housing loans issued	(941)	(919)
Proceeds from repayments of employee housing loans	1,028	1,090
Decrease/(increase) in restricted cash and time deposits, net	29,991	(29,955)
Increase in other long-term assets, net	(2,115)	(811)
Payments for foreign currency derivatives	(41)	0
Acquisition of businesses, net of cash acquired	(2,515)	(30)
Net cash provided by/ (used in) investing activities	11,818	(39,479)
Cash flows from financing activities:
Proceeds related to stock options exercises	12,578	13,955
Excess tax benefit on stock-based compensation plans	4,350	2,382
Proceeds from debt (Note 5)	20,000	0
Repayment of debt (Note 5)	(15,060)	0
Proceeds from government grants	135	0
Acquisition of business, deferred consideration (Note 2)	(2,260)	(30,274)
Net cash provided by/ (used in) financing activities	19,743	(13,937)
Effect of exchange rate changes on cash and cash equivalents	360	(435)
Net increase/(decrease) in cash and cash equivalents	81,275	(44,817)
Cash and cash equivalents, beginning of period	199,449	220,534
Cash and cash equivalents, end of period	$ 280,724	$ 175,717

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-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

+ Details

Name:	us-gaap_ProvisionForDoubtfulAccounts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt and payment of capital lease obligations.

+ References

No definition available.

+ Details

Name:	us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration