CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Cash flows from operating activities:
Net income (loss)	$ (1,959)		$ 2,952
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	1,291		907
Amortization of marketable securities premium	146		71
Stock-based compensation	332		281
Loss on disposal of property, plant and equipment	0		29
Changes in assets and liabilities:
Accounts receivable, net	922		1,350
Inventories	1,649		4,030
Prepaid expenses and other current assets	(1,740)		491
Other assets	105		124
Accounts payable	664		883
Accrued liabilities	(164)	[1]	(1,108)	[1]
Other long-term liabilities	(270)		(459)
Net cash provided by operating activities	976		9,551
Cash flows from investing activities:
Purchases of property, plant and equipment	(1,349)		(1,124)
Purchases of available-for-sale securities	(12,410)		(3,079)
Proceeds from maturities of available-for-sale securities	8,130		2,700
Net cash used in investing activities	(5,629)		(1,503)
Cash flows from financing activities:
Proceeds from common stock options exercised	256		219
Dividends paid by joint ventures	(532)		(3,384)
Net cash used in financing activities	(276)		(3,165)
Effect of exchange rate changes on cash and cash equivalents	87		117
Net increase (decrease) in cash and cash equivalents	(4,842)		5,000
Cash and cash equivalents at the beginning of the period	30,634	[2]	26,156
Cash and cash equivalents at the end of the period	$ 25,792		$ 31,156

[1] Dividends accrued but not paid by joint ventures of $2,365 and $655 was included in accrued liabilities as of March 31, 2013 and March 31, 2012, respectively.

[2] The condensed consolidated balance sheet at December 31, 2012 has been derived from the audited consolidated financial statements at that date.