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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net income $ 13,081 $ 41,340
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 8,470 6,557
Stock-based compensation 8,809 7,079
Provision for excess and obsolete inventory 7,372 8,377
Deferred income taxes 2,845 2,179
Excess tax benefits from stock-based compensation (814) (1,995)
Other 1,001 486
Changes in operating assets and liabilities:    
Trade accounts receivable (16,345) 14,584
Inventories (10,934) (1,044)
Income taxes (3,645) 2,955
Other current assets (8,639) 4,022
Accrued compensation and other liabilities (3,041) (1,180)
Accounts payable 7,681 (1,365)
Other non-current assets/liabilities (195)   
Net cash provided by operating activities 5,646 81,995
Cash flows from investing activities:    
Acquisition of business, net of cash acquired (2,058)   
Purchases of investments (226,377) (199,576)
Maturities of investments 156,306 124,583
Sales of investments 47,243 121,441
Purchases of property, plant and equipment (6,360) (8,012)
Other (59) (26)
Net cash (used in) provided by investing activities (31,305) 38,410
Cash flows from financing activities:    
Proceeds from short-term borrowings 6 2,896
Payments on short-term borrowings (776) (4,771)
Repurchase of common stock (2,875) (4,960)
Net payments related to employee stock awards (2,426) (1,088)
Dividend payments to common stockholders (16,951) (15,806)
Excess tax benefits from stock-based compensation 814 1,995
Net cash (used in) financing activities (22,208) (21,734)
Effect of exchange rate changes on cash and cash equivalents (3,997) (2,371)
(Decrease) increase in cash and cash equivalents (51,864) 96,300
Cash and cash equivalents at beginning of period 287,588 312,916
Cash and cash equivalents at end of period $ 235,724 $ 409,216