CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash Flows From Operating Activities:
Net income	$ 64,733	$ 41,191
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	17,866	26,730
Stock based compensation	3,360	5,475
Realized gain on investments	(25,969)	(8,497)
Loss on sale of investment in affiliate	0	551
Deferred gain (loss) on settled derivatives	(816)	15,793
Provision (recovery) for doubtful debts	(155)	328
Deferred income taxes	(168)	(5,898)
Amortization of debt issuance costs	7,442	3,063
Loss (gain) on sale of property and equipment	(2,240)	45
Deferred rent	23	(44)
Excess tax benefits related to stock option exercises	(387)	(318)
Changes in operating assets and liabilities:
Accounts receivables and unbilled revenue	(11,720)	(27,709)
Prepaid expenses and other assets	(9,137)	(6,081)
Accounts payable	16	7,765
Accrued and other liabilities	3,518	(28,801)
Deferred revenue	(3,602)	(4,781)
Net cash flows (used in) provided by operating activities	42,764	18,812
Cash Flows From Investing Activities:
Purchase of property and equipment	(17,163)	(9,002)
Proceeds from sale of property and equipment	2,536	12
Purchase of available-for-sale investments	(1,014,947)	(956,874)
Proceeds from maturities and sale of available-for-sale investments	1,254,207	961,314
Restricted cash	3,072	(26,349)
Receipts from lease deposits	0	2,430
Purchase of non controlling interests	(23,651)	(207,852)
Net cash flows provided by (used in) investing activities	204,054	(236,321)
Cash Flows From Financing Activities:
Payments on capital lease obligations	(364)	(219)
Proceeds from line of credit and term loans	41,000	225,500
Payments of line of credit and term loans	(269,500)	0
Payment of debt related costs	(2,394)	(2,453)
Proceeds from exercise of stock options	704	6,189
Excess tax benefits related to stock option exercises	387	318
Net cash flows provided by (used in) financing activities	(230,167)	229,335
Effect of exchange rate changes	2,807	(3,853)
Net change in cash and cash equivalents	19,458	7,973
Cash and cash equivalents, beginning of period	95,155	75,440
Cash and cash equivalents, end of period	$ 114,613	$ 83,413