Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Income from continuing operations	$ 7,246	$ 38,192
Loss from discontinued operations	(1,315)	(170)
Net income	5,931	38,022
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	1,832	1,644
Bad debt expense	32	417
Inventory lower-of-cost-or-market adjustments	863	92
Stock-based compensation expense	520	134
Loss on asset dispositions	0	4
Deferred income taxes, net of valuation allowance	2,851	(34,414)
Excess tax deficiency related to stock-based awards	174	0
Changes in operating assets and liabilities:
Trade receivables, net	16,297	13,082
Inventories	(8,253)	5,334
Prepaids and other current assets	1,938	1,377
Income taxes	372	(34)
Trade payables	(5,193)	(16,155)
Accrued liabilities, including warranty obligations	(179)	(2,678)
Net cash provided by operating activities	17,185	6,825
Cash flows from investing activities:
Purchase of marketable securities	(19,050)	0
Proceeds from sale of assets of discontinued operations	0	110
Purchases of property, plant and equipment	(987)	(1,941)
Net cash used in investing activities	(20,037)	(1,831)
Cash flows from financing activities:
Proceeds from exercise of stock options	234	275
Excess tax deficiency related to stock-based awards	(174)	0
Net cash provided by financing activities	60	275
Effect of exchange rate changes on cash and cash equivalents	98	(106)
Increase (decrease) in cash and cash equivalents	(2,694)	5,163
Cash and cash equivalents:
Beginning of period	40,979	23,207
End of period	38,285	28,370
Supplemental disclosure of cash flow information:
Cash paid for interest	12	16
Cash paid for income taxes, net	$ 261	$ 188