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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net Income $ 34,950 $ 27,657
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 12,034 10,260
Amortization of net premium on available-for-sale investments 352 489
Net realized gain on long-term investments (2,869) (4,154)
Net (gain) loss on disposal of property, plant and equipment (10) 21
Gain on bargain purchase of a business   (3,550)
Stock-based compensation expense 5,573 4,601
Deferred income taxes   (463)
Changes in operating assets and liabilities:    
Accounts receivable, net (6,975) (29,370)
Other receivables (2,924) 7,475
Inventory (9,483) (683)
Prepaid expenses and other assets (9,647) (5,180)
Accounts payable (4,727) 16,363
Accrued expenses and other liabilities (2,820) 7,307
Income tax payable/receivable, net 8,571 (2,941)
Net cash provided by operating activities 22,025 27,832
Cash flows from investing activities:    
Purchases of property, plant and equipment (12,304) (12,684)
Proceeds from disposals of property, plant and equipment 16  
Proceeds from sales and maturities of available-for-sale investments 137,272 141,103
Purchases of available-for-sale investments (79,713) (139,181)
Acquisition of business   (943)
Net cash provided by (used in) investing activities 45,271 (11,705)
Cash flows from financing activities:    
Proceeds from stock option exercises 6,606 1,076
Purchases of treasury stock (17,348) (22,917)
Dividend payments (13,031) (13,230)
Net cash used in financing activities (23,773) (35,071)
Net increase (decrease) in cash and cash equivalents 43,523 (18,944)
Effect of exchange rate changes 4,835 686
Cash and cash equivalents, beginning of period 79,895 84,550
Cash and cash equivalents, end of period 128,253 66,292
Supplemental disclosure of non-cash investing activities:    
Purchases of property, plant and equipment included in accounts payable $ 272 $ 1,174