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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:      
Net income $ 187,074 $ 121,485 $ 73,573
Adjustments to reconcile net income to net cash provided by operating activities:      
Net gain on sale of discontinued business (78,182) 0 0
Stock-based compensation expense 20,168 15,158 10,620
Depreciation of property, plant, and equipment 9,868 8,443 7,305
Amortization of intangible assets 4,250 4,024 3,797
Amortization of discounts or premiums on investments 690 1,823 2,519
Realized (gain) loss on sale of investments (344) (673) 403
Revaluation of contingent consideration (790) 0 0
Tax effect of stock option exercises (9,964) (7,871) (7,658)
Change in deferred income taxes (1,409) (2,364) 2,234
Accounts receivable (3,950) (915) (11,311)
Inventories (9,457) (11,750) 666
Accounts payable (8,872) 10,896 2,644
Accrued expenses (2,831) 7,812 5,593
Accrued income taxes 9,957 7,700 7,968
Other 2,155 2,202 (2,898)
Net cash provided by operating activities 118,363 155,970 95,455
Cash flows from investing activities:      
Purchases of investments (686,650) (422,633) (370,781)
Maturities and sales of investments 601,441 339,470 296,091
Purchases of property, plant, and equipment (18,228) (20,934) (9,630)
Cash paid for acquisition of business (1,023) 0 0
Cash paid for purchased technology (10,475) 0 (3,750)
Net proceeds from sale of discontinued business 104,388 0 0
Net cash used in investing activities (10,547) (104,097) (88,070)
Cash flows from financing activities:      
Issuance of common stock under stock plans 27,582 16,930 27,792
Repurchase of common stock (126,351) (59,673) (47,908)
Payment of dividends (18,062) 0 0
Tax effect of stock option exercises 9,964 7,871 7,658
Net cash used in financing activities (106,867) (34,872) (12,458)
Effect of foreign exchange rate changes on cash and cash equivalents (4,668) (1,951) 557
Net change in cash and cash equivalents (3,719) 15,050 (4,516)
Cash and cash equivalents at beginning of year 55,694 40,644 45,160
Cash and cash equivalents at end of year 51,975 55,694 40,644
Stock-based compensation expense 1,533 1,099 837
Depreciation and amortization expense 566 1,141 1,079
Capital expenditures $ 482 $ 631 $ 749