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Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income	$ 463,974	$ 400,294
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment	34,327	36,450
Stock-based compensation	38,237	41,406
Accretion (Amortization) of Discounts and Premiums, Investments	(10,271)	(12,746)
Other Noncash Income (Expense)	(2,126)	(14,752)
Changes in operating assets and liabilities
Other assets	(12,123)	(6,917)
Accounts payable and accrued liabilities	(7,110)	(29,478)
Deferred revenues	24,563	24,844
Deferred Income Taxes	26,571	10,662
Net cash provided by operating activities	560,294	479,267
Net Cash Provided by (Used in) Investing Activities [Abstract]
Proceeds from maturities and sales of marketable securities	1,523,862	3,081,702
Purchases of marketable securities	(1,721,661)	(2,067,498)
Purchases of property and equipment	(31,498)	(29,597)
Other investing activities	(8,530)	(160)
Net cash used in investing activities	(237,827)	984,447
Cash flows from financing activities:
Repayments of Subordinated Debt	0	(1,250,009)
Proceeds from employee stock purchase plans	13,152	12,836
Repurchases of common stock	(583,485)	(459,803)
Net cash used in financing activities	(570,333)	(1,696,976)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	(208)	(985)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(248,074)	(234,247)
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	118,679	240,892
Supplemental cash flow disclosures:
Cash paid for interest	57,074	87,184
Cash paid for income taxes, net of refunds received	$ 75,197	$ 84,433

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The cash outflow from the repayment of long-term borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets or underlying collateral.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

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Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of noncash expense for share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration