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Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 262,614	$ 239,512
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment	24,195	25,172
Stock-based compensation	26,276	25,938
Gain (Loss) on Extinguishment of Debt	6,554	0
Gain (Loss) on Disposition of Business	0	(10,607)
Amortization of Debt Issuance Costs and Discounts	5,719	7,048
Accretion (Amortization) of Discounts and Premiums, Investments	(7,686)	(4,587)
Other, net	1,179	261
Changes in operating assets and liabilities
Other assets	(7,605)	8,310
Accounts payable and accrued liabilities	(20,892)	(38,285)
Deferred revenues	27,296	34,246
Deferred Income Taxes	(25,844)	41,889
Net cash provided by operating activities	291,806	328,897
Net Cash Provided by (Used in) Investing Activities [Abstract]
Proceeds from maturities and sales of marketable securities	2,634,376	2,356,948
Purchases of marketable securities	(1,592,403)	(2,351,738)
Purchases of property and equipment	(18,669)	(18,974)
Other investing activities	(160)	11,748
Net cash used in investing activities	1,023,144	(2,016)
Cash flows from financing activities:
Repayments of Subordinated Debt	(1,250,009)	0
Proceeds from employee stock purchase plans	7,811	7,997
Repurchases of common stock	(281,597)	(325,759)
Net cash used in financing activities	(1,523,795)	(317,762)
Effect of exchange rate changes on cash and cash equivalents	(590)	1,002
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(209,435)	10,121
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, beginning of period	475,139	241,581
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, end of period	265,704	251,702
Supplemental cash flow disclosures:
Cash paid for interest	73,971	58,797
Cash paid for income taxes, net of refunds received	$ 85,597	$ 23,662

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