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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities:    
Net income $ 6,890 $ 6,995
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,692 1,480
Investment premium amortization, net 154 226
Net loss on disposals of property and equipment 26 0
Impairment loss of intangible assets 0 13
Foreign exchange (gain) loss 199 (200)
Share-based compensation expense 2,819 2,801
Excess tax benefits from share-based awards (132) (747)
Deferred income taxes (396) (325)
Equity in net loss of unconsolidated affiliate 34 33
Changes in assets and liabilities:    
Receivables, net (914) 1,276
Inventories (2,123) 1,932
Prepaid expenses and other current assets 2,284 1,053
Other assets (1,447) (85)
Accounts payable 1,103 (1,781)
Accrued payroll and related expenses (419) (3,747)
Accrued taxes 739 (1,452)
Other liabilities (22) (5,601)
Deferred revenue (216) (151)
Warranty reserve 368 (287)
Net cash provided by operating activities 10,639 1,433
Cash flows from investing activities:    
Purchases of held-to-maturity investments (11,369) (29,769)
Proceeds from maturities and redemptions of available-for-sale investments 1,000 0
Proceeds from maturities and redemptions of held-to-maturity investments 8,425 4,747
Purchases of property and equipment (2,578) (582)
Cash paid for investment in unconsolidated affiliate (2,999) 0
Net cash used in investing activities (7,521) (25,604)
Cash flows from financing activities:    
Tax withholdings related to net share settlements of restricted stock units (1,103) (3,556)
Excess tax benefits from share-based awards 132 747
Proceeds from the exercise of warrants 0 12
Dividends paid (2,700) (2,494)
Net cash used in financing activities (3,671) (5,291)
Effect of exchange rate changes on cash and cash equivalents (244) 325
Net decrease in cash and cash equivalents (797) (29,137)
Cash and cash equivalents at beginning of period 88,323 107,015
Cash and cash equivalents at end of period 87,526 77,878
Supplemental disclosure of cash flow information:    
Cash paid for income taxes, net of refunds 718 4,915
Supplemental disclosure of non-cash flow information:    
Change in unrealized gain (loss) on investments, net of tax 9 (1)
Transfers of equipment between inventory and property and equipment, net 1,537 303
Net change in capitalized share-based compensation (77) 40
Common stock withheld for employee taxes in connection with share-based compensation 1,103 3,556
Repayment of notes payable by credits from municipal agency $ 25 $ 25