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Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Operating Activities    
Net income $ 203,843 $ 251,092
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, amortization and other 118,689 106,266
Stock-based compensation expense 133,554 91,567
Deferred income tax expense 18,870 5,756
Effects of exchange rate changes on monetary assets and liabilities denominated in foreign currencies 1,326 6,021
Other non-cash items 3,921 5,166
Total adjustments to reconcile net income to net cash provided by operating activities 276,360 214,776
Changes in operating assets and liabilities, net of the effects of acquisitions:    
Accounts receivable 155,170 182,469
Inventories (2,594) (6,645)
Prepaid expenses and other current assets 22,733 (38,080)
Other assets (31,126) 1,795
Income taxes, net (67,283) (72,405)
Accounts payable 21,256 19,851
Accrued expenses and other current liabilities (62,812) 10,435
Deferred revenues (89,858) (41,100)
Other liabilities 4,224 5,850
Total changes in operating assets and liabilities, net of the effects of acquisitions (50,290) 62,170
Net cash provided by operating activities 429,913 528,038
Investing Activities    
Purchases of available-for-sale investments (19,984) (332,136)
Proceeds from sales of available-for-sale investments 938,031 434,901
Proceeds from maturities of available-for-sale investments 153,708 196,791
Purchases of property and equipment (38,061) (32,929)
Cash paid for acquisitions, net of cash acquired 0 (65,983)
Cash paid for licensing agreements, patents and technology (2,158) (1,217)
Other 1,165 3,002
Net cash provided by investing activities 1,032,701 202,429
Financing Activities    
Proceeds from issuance of common stock under stock-based compensation plans 0 113
Repayment of acquired debt 0 (5,674)
Repayment on convertible notes (1,164,497) 0
Stock repurchases, net (250,000) (764,978)
Cash paid for tax withholding on vested stock awards (70,552) (49,936)
Cash paid for dividends (91,851) 0
Net cash used in financing activities (1,576,900) (820,475)
Effect of exchange rate changes on cash and cash equivalents 240 (3,414)
Change in cash and cash equivalents (114,046) (93,422)
Cash and cash equivalents at beginning of period 618,766 1,115,130
Cash and cash equivalents at end of period $ 504,720 $ 1,021,708