CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net income (loss)	$ 26,056	$ 46,378	$ (902)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	14,540	20,424	24,600
Provision for doubtful accounts and product returns	(192)	153	208
Provision for inventory and warranty reserves	1,713	2,507	2,718
Non-cash stock compensation expense	7,638	8,616	6,226
Deferred taxes	10,419	15,504	(18,289)
Income tax benefits relating to employee stock options	(410)	0	(134)
Unrealized foreign exchange (gain) loss	869	(2,999)	(482)
(Gain) Loss on assets sold/disposed	421	300	(2,177)
Other	846	789	745
Changes in operating assets and liabilities
Accounts receivable	(3,657)	2,720	(2,793)
Inventories	2,071	(13,313)	(3,485)
Prepaid expenses and other current assets	(2,364)	1,732	(24)
Accounts payable	4,771	(3,208)	1,409
Accrued and other liabilities	8,573	(71,550)	76,115
Deferred revenue	65	(457)	742
Income taxes payable	1,086	(1,310)	120
Net cash provided by operating activities	72,445	6,286	84,597
Cash flows from investing activities:
Purchases of property and equipment	(31,578)	(10,504)	(13,481)
Payments for business combinations, net of cash acquired	(44,983)	(1,252)	0
Payments for intangible asset acquisition	(8,500)	0	0
Proceeds from sale of assets held for sale	0	0	5,500
Proceeds from loan receivable	0	0	2,275
Other	0	0	17
Net cash used in investing activities	(85,061)	(11,756)	(5,689)
Cash flows from financing activities:
Proceeds from issuance of common stock, net of issuance costs	219	272	264
Proceeds from exercise of options to purchase common stock	8,000	4,104	7,422
Income tax benefit relating to employee stock options	410	0	134
Net cash provided by financing activities	8,629	4,376	7,820
Effect of exchange rate changes on cash and cash equivalents	53	276	341
Net (decrease) increase in cash and cash equivalents	(3,934)	(818)	87,069
Cash and cash equivalents, beginning of the period	218,787	219,605	132,536
Cash and cash equivalents, end of the period	$ 214,853	$ 218,787	$ 219,605