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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities:    
Net income $ 15,539 $ 43,920
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 12,715 10,197
Stock-based compensation 11,509 9,900
Provision for excess and obsolete inventory 16,554 12,596
Deferred income taxes 3,623 3,059
Excess tax benefits from stock-based compensation (825) (1,998)
Other 1,234 610
Changes in operating assets and liabilities:    
Trade accounts receivable (17,702) 33,992
Inventories (17,949) (893)
Income taxes 3,887 715
Other current assets (2,974) 2,984
Accrued compensation and other liabilities 5,912 7,516
Accounts payable 10,468 (8,750)
Other non-current assets (209)   
Net cash provided by operating activities 41,782 113,848
Cash flows from investing activities:    
Acquisition of businesses, net of cash acquired (2,326) (24,385)
Purchases of investments (374,998) (363,040)
Maturities of investments 253,231 161,102
Sales of investments 90,580 126,928
Purchases of property, plant and equipment (9,154) (11,040)
Other (59) (347)
Net cash used in investing activities (42,726) (110,782)
Cash flows from financing activities:    
Proceeds from short-term borrowings 6 2,896
Payments on short-term borrowings (776) (4,956)
Repurchase of common stock (2,875) (7,026)
Net payments related to employee stock awards (2,464) (830)
Dividend payments to common stockholders (25,458) (24,261)
Excess tax benefits from stock-based compensation 825 1,998
Net cash used in financing activities (30,742) (32,179)
Effect of exchange rate changes on cash and cash equivalents (1,124) 1,165
Decrease in cash and cash equivalents (32,810) (27,948)
Cash and cash equivalents at beginning of period 287,588 312,916
Cash and cash equivalents at end of period $ 254,778 $ 284,968