CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss)/income	$ (105,381)	$ 178,291
Adjustments to reconcile net (loss)/income to net cash provided by operating activities
Depreciation and amortization	11,133	11,620
Provision (benefit) for doubtful accounts / advances	78	(83)
Realized gains on sales of short term investments	(5,461)	(10,437)
Deferred income taxes	5,533	(1,183)
Compensation expense related to restricted stock	5,334	5,104
Unrealized foreign exchange (income)/loss	(2,159)	308
Changes in assets and liabilities:
Accounts receivable and revenue earned in excess of billings	18,301	(29,667)
Other current assets	9,845	(21,426)
Accounts payable, accrued payroll and other liabilities	50,845	23,461
Deferred revenue	(4,429)	(71)
Net cash provided by operating activities	(16,361)	155,917
CASH FLOWS FROM INVESTING ACTIVITIES:
Property and equipment expenditures	(15,368)	(13,852)
Proceeds from sale of property and equipment	228	172
Purchase of mutual funds	(127,303)	(74,859)
Purchase of term deposits with banks	(223,836)	(288,559)
Proceeds from sales of mutual funds	242,026	188,557
Maturities of term deposits with banks	620,178	334,118
Net cash provided by investing activities	495,925	145,577
CASH FLOWS FROM FINANCING ACTIVITIES:
Excess tax benefits on stock-based compensation plans	168	70
Proceeds from loans and borrowings	540,250
Repayment of loans and borrowings	(190,000)	(6,375)
Fees paid relating to loans and borrowing	(1,026)
Advance to transfer agent for dividend payout	(1,261,500)
Net cash used in financing activities	(912,108)	(6,305)
Effect of foreign currency exchange rate changes on cash	(2,711)	(15,993)
Change in cash and cash equivalents	(435,255)	279,196
Cash and cash equivalents, beginning of period	500,499	197,708
Cash and cash equivalents, end of period	65,244	476,904
Supplemental disclosures of cash flow information:
Cash paid for income taxes	263,332	51,826
Cash paid for interest	$ 1,376	$ 1,658