Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
OPERATING ACTIVITIES:
Net income	$ 6,537	$ 4,862
Adjustment for non-cash items included in net income:
Depreciation and amortization	16,697	16,600
Asset and asset-related charges (income)	(597)	(1,332)
Deferred income taxes	2,268	(2,462)
Stock-based compensation	3,528	3,099
Excess tax benefits from stock-based compensation activity	(263)	(350)
Loss (gain) on disposal of property, plant, and equipment	65	(345)
Amortization of discount on long-term debt	6,613
Amortization of premiums paid for short-term investments and marketable securities	1,595
Other	(197)	267
Changes in assets and liabilities:
Receivables	(32,428)	7,104
Inventories	12,415	(9,498)
Accounts payable	9,241	2,730
Income taxes payable	(18)	177
Unearned revenue	(10,919)	(2,499)
Other current assets and liabilities	(6,862)	13,159
Other assets and liabilities	(21,182)	99
Cash provided by (used in) operating activities	(13,507)	31,611
INVESTING ACTIVITIES:
Proceeds from disposal of property, plant, and equipment		1,433
Purchase of investments	(200,846)	(215)
Maturity/sale of investments	53,454	45,000
Capital expenditures	(25,954)	(22,859)
Cash provided by (used in) investing activities	(173,346)	23,359
FINANCING ACTIVITIES:
Proceeds from employee stock activity	252	983
Excess tax benefits from stock-based compensation activity	263	350
Repayments on long-term debt	(25)	(33)
Purchase of common stock held in treasury	(283)	(345)
Cash provided by financing activities	207	955
Effect of exchange rate changes on cash and cash equivalents	(564)	1,493
Increase (decrease) in cash and cash equivalents	(187,210)	57,418
Cash and cash equivalents at beginning of period	376,951	56,216
Cash and cash equivalents at end of period	$ 189,741	$ 113,634