CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net income	$ 5,761	$ 22,768
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,092	3,143
Stock-based compensation	3,798	3,300
Provision for excess and obsolete inventory	3,161	4,263
Deferred income taxes	1,228	1,032
Excess tax benefits from stock-based compensation	(199)	(657)
Other	936	532
Changes in operating assets and liabilities:
Trade accounts receivable	(10,348)	(12,217)
Inventories	(347)	578
Income taxes	(3,253)	3,648
Other current assets	(1,801)	3,519
Accrued compensation and other liabilities	(4,884)	(187)
Accounts payable	4,512	(2,289)
Other non-current assets/liabilities	(193)
Net cash provided by operating activities	2,463	27,433
Cash flows from investing activities:
Acquisition of business	(1,963)
Purchases of investments	(88,525)	(101,257)
Maturities of investments	84,145	105,473
Sales of investments	2,371	15,941
Purchases of property, plant and equipment	(3,356)	(4,567)
Other	130	(146)
Net cash (used in) provided by investing activities	(7,198)	15,444
Cash flows from financing activities:
Proceeds from short-term borrowings	6	2,896
Payments on short-term borrowings		(4,401)
Repurchase of common stock	(1,668)	(3,721)
Net (payments) proceeds related to employee stock awards	(1,251)	19
Dividend payments to common stockholders	(8,448)	(7,877)
Excess tax benefits from stock-based compensation	199	657
Net cash (used in) financing activities	(11,162)	(12,427)
Effect of exchange rate changes on cash and cash equivalents	(4,983)	2,307
(Decrease) increase in cash and cash equivalents	(20,880)	32,757
Cash and cash equivalents at beginning of period	287,588	312,916
Cash and cash equivalents at end of period	$ 266,708	$ 345,673