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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net income $ 12,931 $ 18,322
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 3,908 3,479
Investment premium amortization, net 514 278
Net loss on disposals of property and equipment 25 67
Foreign exchange (gain) loss (743) 223
Share-based compensation expense 6,619 5,885
Excess tax benefits from share-based awards [1] 0 (337)
Deferred income taxes (439) (610)
Equity in net loss of unconsolidated affiliate 72 34
Gain on sale of equity method investment 0 (6,053)
Changes in assets and liabilities:    
Receivables, net (38) 765
Inventories (697) (4,444)
Prepaid expenses and other current assets 125 1,721
Other assets (1,277) (3,028)
Accounts payable 840 7
Accrued payroll and related expenses 495 889
Accrued taxes (723) (1,206)
Other liabilities 2,895 439
Deferred revenue (542) (450)
Warranty reserve 401 742
Net cash provided by operating activities 24,366 16,723
Cash flows from investing activities:    
Purchases of available-for-sale investments (48,219) (429)
Purchases of held-to-maturity investments (32,081) (27,535)
Proceeds from maturities and redemptions of available-for-sale investments 3,960 1,000
Proceeds from maturities and redemptions of held-to-maturity investments 30,698 19,924
Purchases of property and equipment (3,256) (5,649)
Cash paid for investment in unconsolidated affiliate 0 (2,999)
Proceeds from sale of equity method investment 0 8,526
Net cash used in investing activities (48,898) (7,162)
Cash flows from financing activities:    
Tax withholdings related to net share settlements of restricted stock units (2,383) (2,104)
Excess tax benefits from share-based awards [1] 0 337
Dividends paid (6,349) (5,403)
Net cash used in financing activities (8,732) (7,170)
Effect of exchange rate changes on cash and cash equivalents 806 (321)
Net increase (decrease) in cash and cash equivalents (32,458) 2,070
Cash and cash equivalents at beginning of period 91,332 88,323
Cash and cash equivalents at end of period 58,874 90,393
Supplemental disclosure of cash flow information:    
Cash paid for income taxes, net of refunds 6,984 9,986
Supplemental disclosure of non-cash flow information:    
Change in unrealized gain (loss) on investments, net of tax (20) 6
Transfers of equipment between inventory and property and equipment, net 724 3,431
Net change in capitalized share-based compensation 67 (108)
Common stock withheld for employee taxes in connection with share-based compensation 2,383 2,104
Repayment of notes payable by credits from municipal agency $ 51 $ 51
[1] The Company adopted Accounting Standards Update ("ASU") No. 2016-09, "Improvements to Employee Share-based Payment Accounting" ("ASU 2016-09"), during the first quarter of fiscal 2018. This standard eliminates the requirement to reclassify cash flows related to excess tax benefits from operating activities to financing activities on the statements of cash flows. The Company adopted the guidance prospectively effective April 1, 2017. The adoption of ASU 2016-09 is discussed further in Note 2, "Summary of Significant Accounting Policies."