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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:      
Net income $ 35,776 $ 48,029 $ 129,731
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 17,102 14,442 12,980
Stock-based compensation 13,992 13,031 11,225
Provision for excess and obsolete inventory 21,671 15,028 14,857
Provision for doubtful accounts 631 888 449
Deferred income taxes (3,089) 3,819 7,549
Excess tax benefits from stock-based compensation (935) (2,105) (5,338)
Other 200 41 118
Changes in operating assets and liabilities:      
Trade accounts receivable (36,153) 38,288 17,923
Inventories (29,797) 5,341 (11,697)
Income taxes 27,237 (3,126) (5,345)
Other current and non-current assets (1,441) 7,689 (7,674)
Accrued compensation and other liabilities 7,721 4,083 2,904
Accounts payable 23,172 (8,281) (11,646)
Net cash provided by operating activities 76,087 137,167 156,036
Cash flows from investing activities:      
Acquisition of business, net of cash acquired (2,326) (22,607)   
Purchases of investments (550,076) (435,961) (475,777)
Maturities of investments 417,566 313,298 385,613
Sales of investments 110,928 46,559 100,094
Purchases of property, plant and equipment (12,410) (17,705) (15,567)
Other (216) (1,451) (441)
Net cash used in investing activities (36,534) (117,867) (6,078)
Cash flows from financing activities:      
Proceeds from short-term borrowings 6 2,896 41,802
Payments on short-term borrowings (776) (9,348) (39,915)
Repurchases of common stock (2,875) (11,501) (2,007)
Net proceeds related to employee stock awards (464) 1,564 28,546
Dividend payments (33,975) (32,686) (31,373)
Excess tax benefit from stock-based compensation 935 2,105 5,338
Net cash (used in) provided by financing activities (37,149) (46,970) 2,391
Effect of exchange rate changes on cash and cash equivalents (1,090) 2,342 (1,909)
Increase (decrease) in cash and cash equivalents 1,314 (25,328) 150,440
Cash and cash equivalents at beginning of year 287,588 312,916 162,476
Cash and cash equivalents at end of year 288,902 287,588 312,916
Cash paid during the period for:      
Interest 60 212 19
Income taxes $ 5,974 $ 18,033 $ 52,561