CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011 Scenario, Actual [Member]
Cash flows from operating activities:
Net income	$ 21,153,000	$ 92,891,000	$ 226,367,000
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	22,767,000	27,495,000	31,983,000
Provision for doubtful accounts	157,000	125,000	1,473,000
Non-cash provision for restructuring	0	1,459,000	326,000
Loss (gain) on sales of assets	(125,000)	(252,000)	597,000
Gain on divestiture of consumer business	0	(37,972,000)	0
(Gain) loss on disposal of fixed assets			0
Stock-based compensation expense	6,917,000	11,432,000	12,609,000
Noncash interest expense	294,000	294,000	301,000
Unrealized foreign currency transaction (gains) losses	(10,000)	(1,251,000)	1,818,000
Provision for deferred taxes	730,000	(400,000)	(1,994,000)
Changes in operating assets and liabilities, excluding initial effects of acquisitions:
Accounts receivable	11,030,000	26,765,000	(3,804,000)
Inventories	9,021,000	20,844,000	(3,317,000)
Prepaid expenses and other current assets	4,393,000	(3,745,000)	(223,000)
Accounts payable	(1,416,000)	(7,111,000)	(4,533,000)
Accrued expenses, compensation and benefits and other liabilities	8,932,000	(3,300,000)	(17,436,000)
Income taxes payable	(1,324,000)	676,000	(640,000)
Deferred revenues	(91,664,000)	(93,241,000)	(240,560,000)
Net Cash Provided by (Used in) Operating Activities	(9,145,000)	34,709,000	2,967,000
Income Taxes Paid, Net	2,173,000	6,554,000	3,805,000
Interest Paid	1,281,000	1,224,000	1,508,000
Cash flows from investing activities:
Purchases of property and equipment	(11,625,000)	(9,703,000)	(10,795,000)
Capitalized software development costs	0	0	1,242,000
Change in other long-term assets	(36,000)	(40,000)	(155,000)
Proceeds from divestiture of consumer business	0	11,440,000	0
Proceeds from sale of assets	125,000	0	0
Net Cash Provided by (Used in) Investing Activities	(11,536,000)	1,697,000	(12,192,000)
Cash flows from financing activities:
Proceeds from issuance of common stock under employee stock plans, net	177,000	1,022,000	3,239,000
Common stock repurchases for tax withholdings for net settlement of equity awards	(273,000)	(668,000)	(1,213,000)
Proceeds from revolving credit facilities	0	14,000,000	21,000,000
Payments on revolving credit facilities	0	(14,000,000)	(21,000,000)
Net Cash Provided by (Used in) Financing Activities	(96,000)	354,000	2,026,000
Effect of exchange rate changes on cash and cash equivalents	(1,410,000)	775,000	(2,728,000)
Net decrease in cash and cash equivalents	(22,187,000)	37,535,000	(9,927,000)
Cash and cash equivalents at beginning of period	70,390,000	32,855,000	42,782,000
Cash and cash equivalents at end of period	$ 48,203,000	$ 70,390,000	$ 32,855,000