CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities:
Net loss	$ (23,791)	$ (36,954)	$ (68,355)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	31,983	33,480	32,130
Provision for doubtful accounts	1,561	194	1,930
Non-cash provision for restructuring	326	417	3,140
Loss (gain) on sales of assets	597	(5,029)	(155)
(Gain) loss on disposal of fixed assets	(24)	(78)	43
Compensation expense from stock grants and options	14,619	13,921	13,394
Noncash interest expense	301	52	0
Unrealized foreign currency transaction (gains) losses	(135)	1,078	2,656
Changes in deferred tax assets and liabilities, excluding initial effects of acquisitions	(1,658)	(1,160)	(1,634)
Changes in operating assets and liabilities, excluding initial effects of acquisitions:
Accounts receivable	(4,904)	(19,313)	22,660
Inventories	(3,475)	(27,672)	17,766
Prepaid expenses and other current assets	(298)	9,251	8,980
Accounts payable	(4,769)	15,941	739
Accrued expenses, compensation and benefits and other liabilities	(14,323)	716	(14,062)
Income taxes payable	(757)	1,669	(6,330)
Deferred revenues	5,611	816	(26,373)
Net cash used in operating activities	864	(12,671)	(13,471)
Cash flows from investing activities:
Purchases of property and equipment	(10,771)	(28,892)	(18,689)
Payments for other long-term assets	(1,099)	(523)	(11,432)
Payments for business acquisitions, net of cash acquired	0	(27,008)	(4,413)
Proceeds from sales of assets, net	0	4,502	3,502
Proceeds from notes receivable	0	0	2,500
Purchases of marketable securities	0	(2,250)	(55,741)
Proceeds from sales of marketable securities	0	19,605	64,318
Net cash used in investing activities	(11,870)	(34,566)	(19,955)
Cash flows from financing activities:
Payments related to stock option purchase	0	0	(526)
Purchases of common stock for treasury	(2,026)	(736)	(646)
Proceeds from issuance of common stock under employee stock plans, net	2,026	736	646
Proceeds from revolving credit facilities	21,000	5,000	0
Payments on revolving credit facilities	(21,000)	(5,000)	0
Payments for credit facility issuance costs	0	(1,132)	0
Net cash (used in) provided by financing activities	2,026	(396)	120
Effect of exchange rate changes on cash and cash equivalents	(947)	(1,102)	3,031
Net decrease in cash and cash equivalents	(9,927)	(48,735)	(30,275)
Cash and cash equivalents at beginning of period	42,782	91,517	121,792
Cash and cash equivalents at end of period	$ 32,855	$ 42,782	$ 91,517