Income Taxes (Componentes of Deferred Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Allowance for doubtful accounts	$ 275	$ 291
Inventory reserve	1,933	1,837
Accrued liabilities	3,094	2,985
Other, current	6,052	6,691
Gross current deferred income tax assets	11,354	11,804
Valuation allowance	(10,209)	(10,687)
Net current deferred income tax assets	1,145	1,117
Net operating losses	89,742	112,199
Tax credits	758	775
Depreciation and amortization	433	(1,985)
Investments	0	(38)
Capital loss carry forwards	40,739	41,510
Gross long-term deferred income tax assets	131,672	152,461
Valuation allowance	(127,961)	(148,065)
Net long-term deferred income tax asset	3,711	4,396
Total	$ 4,856	$ 5,513