CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income	$ 23,899	$ 14,714
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,102	4,200
Bad debt expense	552	514
Deferred taxes	(482)	95
Stock-based compensation expense	10,964	9,134
Excess tax benefit on stock-based compensation plans	(2,040)	(436)
Other	50	4,964
(Increase)/decrease in operating assets:
Accounts receivable	16,993	15,262
Unbilled revenues	(18,559)	(32,261)
Prepaid expenses and other assets	(1,383)	48
Increase/(decrease) in operating liabilities:
Accounts payable	671	9,669
Accrued expenses and other liabilities	(34,098)	(10,374)
Deferred revenues	(55)	(9)
Due to employees	12,420	3,224
Taxes payable	(3,173)	(11,873)
Net cash provided by operating activities	10,861	6,871
Cash flows from investing activities:
Purchases of property and equipment	(6,185)	(1,873)
Payment for construction of corporate facilities	0	(1,591)
Employee housing loans issued	0	(266)
Proceeds from repayments of employee housing loans	470	518
Decrease/(increase) in restricted cash and time deposits, net	30,000	(29,959)
Increase in other long-term assets, net	(774)	(681)
Payments for foreign currency derivatives	(91)	0
Acquisition of businesses, net of cash acquired (Note 2)	0	(30)
Net cash provided by/ (used in) investing activities	23,420	(33,882)
Cash flows from financing activities:
Proceeds related to stock options exercises	3,108	3,855
Excess tax benefit on stock-based compensation plans	2,040	436
Proceeds from debt (Note 5)	20,000	0
Repayment of debt (Note 5)	(15,031)	0
Proceeds from government grants	135	0
Acquisition of business, deferred consideration (Note 2)	(463)	(2,801)
Net cash provided by financing activities	9,789	1,490
Effect of exchange rate changes on cash and cash equivalents	1,358	(2,650)
Net increase/(decrease) in cash and cash equivalents	45,428	(28,171)
Cash and cash equivalents, beginning of period	199,449	220,534
Cash and cash equivalents, end of period	$ 244,877	$ 192,363

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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