CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012 Scenario, Actual [Member]
Cash flows from operating activities:
Net income	$ 17,442,000	$ 19,478,000
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	11,800,000	14,516,000
(Recovery from) provision for doubtful accounts	30,000	(96,000)
Non-cash provision for restructuring		0
Gain on sales of assets	(125,000)	(252,000)
Gain on disposal of fixed assets		0
Stock-based compensation expense	4,185,000	7,405,000
Non-cash interest expense	147,000	147,000
Foreign currency transaction gains	(84,000)	(1,819,000)
Provision for deferred taxes	9,000	823,000
Changes in operating assets and liabilities, excluding initial effects of acquisitions:
Accounts receivable	12,277,000	12,262,000
Inventories	5,896,000	22,638,000
Prepaid expenses and other current assets	1,225,000	(1,242,000)
Accounts payable	(6,661,000)	(3,531,000)
Accrued expenses, compensation and benefits and other liabilities	(6,516,000)	4,916,000
Income taxes payable	(680,000)	2,274,000
Deferred revenues	(44,501,000)	(44,756,000)
Net cash provided by (used in) operating activities	(5,556,000)	32,763,000
Cash flows from investing activities:
Purchases of property and equipment	(5,290,000)	(5,023,000)
Proceeds from sale of assets	125,000	0
Increase in other long-term assets	(18,000)	(30,000)
Net cash used in investing activities	(5,183,000)	(5,053,000)
Cash flows from financing activities:
Proceeds from the issuance of common stock under employee stock plans, net	177,000	573,000
Common stock repurchases for tax withholdings for net settlement of equity awards	232,000	493,000
Proceeds from revolving credit facilities	0	1,000,000
Payments on revolving credit facilities	0	(1,000,000)
Net cash provided by financing activities	(55,000)	80,000
Effect of exchange rate changes on cash and cash equivalents	(3,492,000)	(1,262,000)
Net increase (decrease) in cash and cash equivalents	(14,286,000)	26,528,000
Cash and cash equivalents at beginning of period	70,390,000	32,855,000
Cash and cash equivalents at end of period	56,104,000	59,383,000
Cash paid for income taxes, net of refunds	893,000	1,916,000
Cash paid for interest	$ 562,000