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 income (loss)	$ (3,367)	$ 19,104
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Depreciation and amortization	2,941	2,021
Stock-based compensation	494	866
Deferred taxes	(2,794)
Changes in operating assets and liabilities:
Accounts receivable	20,352	(4,039)
Inventories	(9,431)	(77)
Other inventory supplies	1,996	(1,450)
Prepaid expenses and other assets	2,634	(255)
Accounts payable	(6,731)	(3,433)
Accrued payroll	(900)	(1,699)
Corporate income and franchise taxes	(299)	950
Advanced payments	405	1,799
Accrued and other current liabilities	(406)	2,446
Net cash provided by operating activities	4,894	16,233
Cash flows from investing activities
Purchases of property and equipment	(4,570)	(11,083)
Purchases of investments	(628)
Proceeds from sale of investments	10,800	737
Net cash provided by (used in) investing activities	5,602	(10,346)
Cash flows from financing activities
Proceeds from exercise of options	4	736
Restricted cash	43	(8)
Net cash provided by financing activities	47	728
Net effect of currency translation	(262)	(25)
Net increase in cash and cash equivalents	10,281	6,590
Cash and cash equivalents, beginning of period	4,290	16,073
Cash and cash equivalents, end of period	14,571	22,663
Supplemental disclosures of non-cash transactions
Unrealized (gain) loss on investments	$ (42)	$ 22

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Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation).