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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities:    
Net income $ 37,007 $ 21,941
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation 9,148 13,105
Amortization of intangible assets 2,593 1,708
Loss (gain) on investments in privately held companies 259 (1)
Gain on disposal of property, plant and equipment (3) 0
Share-based compensation expense 10,705 8,517
Deferred income taxes (9,879) (1,048)
Change in fair value of contingent consideration for business acquisition (1,978) 0
Changes in assets and liabilities, net of acquisitions:    
Accounts receivable, net (35,702) (48,661)
Inventories (20,389) (10,007)
Other assets (3,088) (1,171)
Accounts payable 38,647 42,769
Accrued and other liabilities (28,203) (10,135)
Net cash provided by (used in) operating activities (883) 17,017
Cash flows from investing activities:    
Purchases of property, plant and equipment (10,035) (8,135)
Investment in privately held companies (360) (320)
Acquisitions, net of cash acquired 0 (53,987)
Changes in restricted cash 0 715
Purchases of trading investments (609) (4,229)
Proceeds from sales of trading investments 647 4,231
Net cash used in investing activities (10,357) (61,725)
Cash flows from financing activities:    
Purchases of registered shares (624) (24,422)
Proceeds from exercises of stock options 12,569 599
Tax withholdings related to net share settlements of restricted stock units (21,683) (9,185)
Net cash used in financing activities (9,738) (33,008)
Effect of exchange rate changes on cash and cash equivalents 1,102 (1,368)
Net decrease in cash and cash equivalents (19,876) (79,084)
Cash and cash equivalents, beginning of the period 547,533 519,195
Cash and cash equivalents, end of the period 527,657 440,111
Non-cash investing activities:    
Property, plant and equipment purchased during the period and included in period end liability accounts $ 3,713 $ 3,502