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Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income	$ 310,061	$ 262,614
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment	22,884	24,195
Stock-based compensation	25,617	26,276
Accretion (Amortization) of Discounts and Premiums, Investments	(5,679)	(7,686)
Other Noncash Income (Expense)	(894)	(13,452)
Changes in operating assets and liabilities
Other assets	(10,254)	(7,605)
Accounts payable and accrued liabilities	(39,351)	(20,892)
Deferred revenues	31,857	27,296
Deferred Income Taxes	16,146	(25,844)
Net cash provided by operating activities	352,175	291,806
Net Cash Provided by (Used in) Investing Activities [Abstract]
Proceeds from maturities and sales of marketable securities	1,466,303	2,634,376
Purchases of marketable securities	(1,021,741)	(1,592,403)
Purchases of property and equipment	(20,189)	(18,669)
Other investing activities	(6,311)	(160)
Net cash used in investing activities	418,062	1,023,144
Cash flows from financing activities:
Repayments of Subordinated Debt	0	(1,250,009)
Proceeds from employee stock purchase plans	8,253	7,811
Repurchases of common stock	(384,532)	(281,597)
Net cash used in financing activities	(376,279)	(1,523,795)
Effect of exchange rate changes on cash and cash equivalents	243	(590)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	394,201	(209,435)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, beginning of period	366,753	475,139
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, end of period	760,954	265,704
Supplemental cash flow disclosures:
Cash paid for interest	43,708	73,971
Cash paid for income taxes, net of refunds received	$ 62,214	$ 85,597

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 10
-Section 45
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