Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (4,481)	$ (3,424)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	2,836	3,008
Loss (gain) on disposal of fixed assets	6	(28)
Share-based compensation expense	1,845	3,369
Deferred income tax (benefit) expense	(904)	287
Realized loss on sales of marketable securities	0	26
Changes in operating assets and liabilities:
Receivables	(2,670)	(3,341)
Inventories, net	5,644	4,281
Supplier advances	(563)	(68)
Other assets	2,256	3,012
Accounts payable	9,854	6,572
Accrued payroll and related benefits	2,477	(1,038)
Deferred revenue	571	325
Income taxes	(1,916)	(2,228)
Other accrued expenses and liabilities	117	2,579
Net cash provided by operating activities	15,072	13,332
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of marketable securities	(28)	(54)
Proceeds from sales of marketable securities	0	20,897
Capital additions	(1,345)	(1,384)
Proceeds from the sale of fixed assets	0	58
Net cash (used in) provided by investing activities	(1,373)	19,517
CASH FLOWS FROM FINANCING ACTIVITIES:
Exercise of stock options	9	128
Taxes related to equity compensation awards, net	(250)	(443)
Payment of dividends	(4,937)	(4,851)
Net cash used in financing activities	(5,178)	(5,166)
NET INCREASE IN CASH AND CASH EQUIVALENTS	8,521	27,683
CASH AND CASH EQUIVALENTS, beginning of period	47,594	20,376
CASH AND CASH EQUIVALENTS, end of period	$ 56,115	$ 48,059