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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net income $ 150,354 $ 334,116
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation of property and equipment 11,574 11,232
Stock-based compensation 12,974 11,441
Other Noncash Income (Expense) (1,155) 1,311
Changes in operating assets and liabilities    
Other assets (6,758) 28
Accounts payable and accrued liabilities (7,613) (27,409)
Deferred revenues 36,153 22,807
Deferred Income Taxes 497 (170,844)
Net cash provided by operating activities 198,336 180,060
Net Cash Provided by (Used in) Investing Activities [Abstract]    
Proceeds from maturities and sales of marketable securities 793,857 805,748
Purchases of marketable securities (962,340) (730,507)
Payments for (Proceeds from) Businesses and Interest in Affiliates 0 14,856
Purchases of property and equipment (6,721) (11,013)
Net cash used in investing activities (175,204) 79,084
Cash flows from financing activities:    
Proceeds from employee stock purchase plans 8,101 8,296
Repurchases of common stock (185,414) (275,623)
Net cash used in financing activities (177,313) (267,327)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents (202) (1,316)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect (154,383) (9,499)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, beginning of period 410,601 517,601
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, end of period 256,218 508,102
Supplemental cash flow disclosures:    
Cash paid for interest 13,156 13,151
Cash paid for income taxes, net of refunds received $ 17,286 $ 15,914