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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Operating activities:    
Net income $ 88,923 $ 90,066
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 4,365 2,959
Bad debt (recoveries) expense (21) 188
Stock-based compensation 13,121 12,245
Write-down of inventory and other 1,259 897
Accretion on marketable securities (1,306) (363)
Change in fair value of other investments (39,654)  
Deferred tax provision 10,776 (44,463)
Change in fair value of contingent consideration 356 (159)
Other non-cash operating activities 1,003  
Changes in assets and liabilities:    
Accounts receivable 4,801 1,930
Inventories (7,239) (7,794)
Prepaid expenses and other assets (3,417) (2,131)
Accounts payable (1,463) 2,684
Accrued expenses and other liabilities (6,643) (6,576)
Deferred revenue (233) (2,852)
Net cash provided by operating activities 64,628 46,631
Investing activities:    
Purchases of marketable securities (124,067) (24,702)
Proceeds from the sale and maturity of marketable securities and other 93,180 75,782
Purchases of other investments and intangible assets (2,800) (1,166)
Purchases of property and equipment (12,250) (15,147)
Net cash (used for) provided by investing activities (45,937) 34,767
Financing activities:    
Proceeds from the exercise of stock options 1,260 5,798
Taxes paid related to net share settlement upon vesting of stock awards (40,536) (67,598)
Net cash used for financing activities (39,276) (61,800)
Effect of exchange rate changes on cash 612 (1,285)
Net (decrease) increase in cash and cash equivalents (19,973) 18,313
Cash and cash equivalents at beginning of period 121,021 42,975
Cash and cash equivalents at end of period 101,048 61,288
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 2,584 2,956
Supplemental disclosure of non-cash activities:    
Property and equipment in accounts payable and accrued expenses 3,619 $ 3,196
Right-of-use assets obtained in exchange for lease liabilities $ 14,139