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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 $ 122,297 $ 115,778 $ 35,776
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 22,103 20,514 17,102
Stock-based compensation 13,013 11,315 13,992
Provision for excess and obsolete inventory 13,602 12,131 21,671
Provision for doubtful accounts (255) 668 631
Deferred income taxes 410 5,264 (3,089)
Excess tax benefits from stock-based compensation (904) (447) (935)
Other 275 139 200
Changes in operating assets and liabilities:      
Trade accounts receivable 2,334 6,103 (36,153)
Inventories (14,501) (20,910) (29,797)
Income taxes (8,462) (32,744) 24,441
Other current and non-current assets (1,526) (325) 1,355
Accrued compensation 3,335 (13,563) 13,677
Other current and non-current liabilities (2,797) 3,469 (5,956)
Accounts payable (10,629) (5,478) 23,172
Net cash provided by operating activities 138,295 101,914 76,087
Cash flows from investing activities:      
Acquisition of business, net of cash acquired (9,910) (86,950) (2,326)
Purchases of investments (385,999) (360,813) (550,076)
Maturities of investments 179,285 249,359 417,566
Sales of investments 61,659 185,186 110,928
Purchases of property, plant and equipment (12,414) (13,183) (12,410)
Other 8 1,593 (216)
Net cash used in investing activities (167,371) (24,808) (36,534)
Cash flows from financing activities:      
Proceeds from short-term borrowings     6
Payments on short-term borrowings     (776)
Repurchases of common stock (13,294) (20,809) (2,875)
Net proceeds related to employee stock awards 1,262 2,492 (464)
Dividend payments (35,969) (34,851) (33,975)
Excess tax benefit from stock-based compensation 904 447 935
Net cash used in financing activities (47,097) (52,721) (37,149)
Effect of exchange rate changes on cash and cash equivalents (1,690) (7,850) (1,090)
(Decrease) increase in cash and cash equivalents (77,863) 16,535 1,314
Cash and cash equivalents at beginning of year 305,437 288,902 287,588
Cash and cash equivalents at end of year 227,574 305,437 288,902
Cash paid during the period for:      
Interest 34 44 60
Income taxes $ 43,239 $ 47,948 $ 11,878