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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:    
Net income $ 31,245 $ 5,761
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 4,150 4,092
Stock-based compensation 3,198 3,798
Provision for excess and obsolete inventory 2,613 3,161
Provision for bad debt 94 969
Deferred income taxes (3,974) 1,228
Excess tax benefits from stock-based compensation (189) (199)
Other (141) (33)
Changes in operating assets and liabilities:    
Trade accounts receivable (2,784) (10,348)
Inventories (7,402) (347)
Income taxes (5,462) (3,253)
Other current assets (1,286) (1,801)
Accrued compensation (6,872) (2,271)
Other current liabilities 2,512 (2,613)
Accounts payable (4,656) 4,512
Other non-current assets (1,143) (193)
Net cash provided by operating activities 9,903 2,463
Cash flows from investing activities:    
Acquisition of businesses, net of cash acquired   (1,963)
Purchases of investments (128,524) (88,525)
Maturities of investments 104,623 84,145
Sales of investments 24,948 2,371
Purchases of property, plant and equipment (3,098) (3,356)
Other 79 130
Net cash used in investing activities (1,972) (7,198)
Cash flows from financing activities:    
Proceeds from short-term borrowings   6
Repurchase of common stock (945) (1,668)
Net payments related to employee stock awards (762) (1,251)
Dividend payments to common stockholders (8,553) (8,448)
Excess tax benefits from stock-based compensation 189 199
Net cash used in financing activities (10,071) (11,162)
Effect of exchange rate changes on cash and cash equivalents 328 (4,983)
Decrease in cash and cash equivalents (1,812) (20,880)
Cash and cash equivalents at beginning of period 288,902 287,588
Cash and cash equivalents at end of period $ 287,090 $ 266,708