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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income $ 177,178 $ 149,572 $ 187,074
Adjustments to reconcile net income to net cash provided by operating activities:      
(Gain) loss on sale of discontinued business 0 255 (78,182)
Stock-based compensation expense 31,942 20,558 20,168
Depreciation of property, plant, and equipment 13,683 11,678 9,868
Amortization of intangible assets 3,308 3,391 4,250
Impairment of intangible assets 469 0 0
Amortization of discounts or premiums on investments 205 383 690
Realized (gain) loss on sale of investments (829) (1,506) (344)
Revaluation of contingent consideration (28) (463) (790)
Change in deferred income taxes 1,787 (1,908) (1,409)
Accounts receivable (55,185) (13,251) (3,950)
Unbilled revenue (4,604) (2,308) (242)
Inventories (37,088) 10,409 (9,457)
Accounts payable 12,322 2,087 (8,872)
Accrued expenses 14,476 7,771 (2,831)
Accrued income taxes 71,327 2,110 9,957
Deferred revenue and customer deposits 1,035 (3,188) 1,527
Other (5,675) (3,509) 870
Net cash provided by operating activities 224,323 182,081 128,327
Cash flows from investing activities:      
Purchases of investments (636,856) (751,868) (686,650)
Maturities and sales of investments 584,464 657,250 601,441
Purchases of property, plant, and equipment (28,754) (12,816) (18,228)
Cash paid for acquisition of business, net of cash acquired (24,118) (14,285) (1,023)
Cash paid for purchased technology 0 0 (10,475)
Net cash received (paid) from sale of discontinued business (291) (113) 104,388
Net cash used in investing activities (105,555) (121,832) (10,547)
Cash flows from financing activities:      
Issuance of common stock under stock plans 54,557 43,468 27,582
Repurchase of common stock (123,715) (47,149) (126,351)
Payment of dividends (29,037) (25,213) (18,062)
Payment of contingent consideration (1,926) (337) 0
Net cash used in financing activities (100,121) (29,231) (116,831)
Effect of foreign exchange rate changes on cash and cash equivalents 8,294 (3,352) (4,668)
Net change in cash and cash equivalents 26,941 27,666 (3,719)
Cash and cash equivalents at beginning of year 79,641 51,975 55,694
Cash and cash equivalents at end of year 106,582 79,641 51,975
Stock-based compensation expense 0 0 1,533
Depreciation and amortization expense 0 0 566
Capital expenditures $ 0 $ 0 $ 482