CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011
Cash flows from operating activities:
Net income	$ 6,823		$ 22,217
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,832		2,512
Amortization of marketable securities premium	220		279
Loss (gain) on disposal of property, plant and equipment, net	176		(30)
Stock-based compensation	873		638
Realized loss on sale of investments	0		8
Changes in assets and liabilities:
Accounts receivable, net	1,076		1,123
Inventories	6,071		(8,209)
Prepaid expenses and other current assets	1,923		(3,016)
Other assets	(97)		(1,406)
Accounts payable	1,287		(538)
Accrued liabilities	(795)		(702)
Other long-term liabilities	(824)		(848)
Net cash provided by operating activities	19,565		12,028
Cash flows from investing activities:
Purchases of property, plant and equipment	(4,951)		(9,573)
Proceeds from sale of property, plant and equipment	0		23
Purchases of available for sale securities	(8,225)		(13,951)
Proceeds from sale of available for sale securities	6,660		15,938
Investments in joint ventures	0		(2,646)
Loan to related party	0		(775)
Net cash used in investing activities	(6,516)		(10,984)
Cash flows from financing activities:
Proceeds from common stock options exercised	276		637
Dividends paid by joint ventures	(4,086)		(1,636)
Net cash used in financing activities	(3,810)		(999)
Effect of exchange rate changes on cash and cash equivalents	108		632
Net increase in cash and cash equivalents	9,347		677
Cash and cash equivalents at the beginning of the period	26,156	[1]	23,724
Cash and cash equivalents at the end of the period	$ 35,503		$ 24,401

[1] The Condensed Consolidated Balance Sheet at December 31, 2011 has been derived from the audited consolidated financial statements at that date.