| Cash flows from operating activities: | |
| Net income | |
| Adjustments to reconcile net income to net cash provided by operating activities: | |
| Depreciation and amortization | |
| Stock-based compensation | |
| Net disposals and impairments of assets | |
| Excess tax benefits from stock-based compensation | -6.45M |
| Deferred income taxes | |
| Changes in operating assets and liabilities: | |
| Accounts receivable | |
| Inventories | |
| Income taxes | |
| Prepaid expenses and other assets | |
| Accounts payable | |
| Customer prepayments | |
| Accrued compensation and benefits | |
| Other taxes and withholding | |
| Warranty liabilities | |
| Other accruals and liabilities | |
| Net cash provided by operating activities | |
| Cash flows from investing activities: | |
| Investments in marketable debt securities | |
| Purchases of property and equipment | |
| Increase in restricted cash | |
| Proceeds from sales of property and equipment | |
| Net cash used in investing activities | |
| Cash flows from financing activities: | |
| Net decrease in short-term borrowings | |
| Excess tax benefits from stock-based compensation | 6.45M |
| Proceeds from issuance of common stock | |
| Repurchases of common stock | |
| Debt issuance costs | |
| Net cash provided by (used in) financing activities | |
| Net (decrease) increase in cash and cash equivalents | |
| Cash and cash equivalents, at beginning of period | |
| Cash and cash equivalents, at end of period | |