Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Income from continuing operations	$ 13,078	$ 7,246
Income (loss) from discontinued operations	78	(1,315)
Net income	13,156	5,931
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	1,718	1,832
Provision for (benefit from) allowance for doubtful accounts	(118)	32
Inventory lower-of-cost-or-market adjustments	68	863
Stock-based compensation expense	669	520
Loss on asset dispositions	258	0
Deferred income taxes, net of valuation allowance	7,322	2,851
Excess tax deficiency related to stock-based awards	1	174
Changes in operating assets and liabilities:
Trade receivables	13,899	16,297
Inventories	(3,537)	(8,253)
Prepaids and other current assets	2,679	1,938
Income taxes	(121)	372
Trade payables	(15,281)	(5,193)
Accrued liabilities, including warranty obligations	(2,008)	(179)
Net cash provided by operating activities	18,705	17,185
Cash flows from investing activities:
Purchases of available-for-sale securities	(43,240)	(19,050)
Proceeds from maturities of available-for-sale securities	17,095	0
Proceeds from sales of available-for-sale securities	3,381	0
Purchases of property, plant and equipment	(1,252)	(987)
Net cash used in investing activities	(24,016)	(20,037)
Cash flows from financing activities:
Proceeds from exercise of stock options	975	234
Payments for stock repurchases	(1,996)	0
Tax payments related to stock award issuances	(775)	0
Excess tax deficiency related to stock-based awards	(1)	(174)
Net cash provided by (used in) financing activities	(1,797)	60
Effect of exchange rate changes on cash and cash equivalents	(609)	98
Decrease in cash and cash equivalents	(7,717)	(2,694)
Cash and cash equivalents:
Beginning of period	45,206	40,979
End of period	37,489	38,285
Supplemental disclosure of cash flow information:
Cash paid for interest	(11)	(12)
Cash paid for income taxes, net	(760)	(261)
Supplemental disclosure of non-cash investing activities:
Capital expenditures incurred but not yet paid	$ 1,166	$ 0