Condensed Consolidated Statements Of Cash Flow (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Operating activities
Net income	$ 28,797	$ 21,672
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	6,058	5,755
Stock-based compensation expense	1,460	1,204
Gain on sale of equipment	(2)	(357)
Deferred income taxes	(334)	(218)
Changes in operating assets and liabilities:
Trade receivables, net	(8,152)	3,776
Inventories, net	(25,337)	(7,203)
Prepaids and other assets	(2,640)	1,357
Excess tax benefits of stock option exercises	(53)	(48)
Trade accounts payable and accrued expenses	(1,269)	14,633
Net cash provided by (used in) operating activities	(1,472)	40,571
Investing activities
Purchase of property, plant and equipment	(13,867)	(19,809)
Proceeds from sale of equipment	157	1,045
Net cash used in investing activities	(13,710)	(18,764)
Financing activities
Principal payments on debt	(12)	(172)
Proceeds from exercise of stock options	491	310
Excess tax benefits of stock option exercises	53	48
Net cash provided by financing activities	532	186
Effect of exchange rate changes on cash activities	1,562	433
Increase (decrease) in cash and cash equivalents	(13,088)	22,426
Cash and cash equivalents at beginning of period	298,576	245,850
Cash and cash equivalents at end of period	$ 285,488	$ 268,276

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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).