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Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 162,527	$ 134,263
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment	11,593	12,117
Stock-based compensation	12,462	12,978
Accretion (Amortization) of Discounts and Premiums, Investments	(3,854)	(4,128)
Other, net	(147)	4,005
Changes in operating assets and liabilities
Other assets	(226)	(987)
Accounts payable and accrued liabilities	(31,609)	(36,271)
Deferred revenues	29,219	27,120
Deferred Income Taxes	7,365	(59,108)
Net cash provided by operating activities	187,330	89,989
Net Cash Provided by (Used in) Investing Activities [Abstract]
Proceeds from maturities and sales of marketable securities	939,561	1,931,930
Purchases of marketable securities	(496,779)	(631,456)
Purchases of property and equipment	(9,133)	(7,662)
Other investing activities	(2,958)	(160)
Net cash used in investing activities	430,691	1,292,652
Cash flows from financing activities:
Proceeds from employee stock purchase plans	8,253	7,811
Repurchases of common stock	(204,302)	(152,741)
Net cash used in financing activities	(196,049)	(144,930)
Effect of exchange rate changes on cash and cash equivalents	255	167
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	422,227	1,237,878
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	788,980	1,713,017
Supplemental cash flow disclosures:
Cash paid for interest	13,063	43,326
Cash paid for income taxes, net of refunds received	$ 14,185	$ 72,959

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