Condensed Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Condensed Consolidated Statements Of Comprehensive Income (Loss) [Abstract]
Net income (loss)	$ (9,452)	$ (2,921)	$ 2,852
Other comprehensive income (loss), net of tax:
Unrealized holding loss on short-term investments arising during the period		32	(31)
Defined benefit pension plans:
Amortization of transition obligation	18	18	18
Prior service (cost) credit arising during year	294	(176)	(176)
Net income (loss) arising during year	668	(2,069)	691
Other comprehensive income (loss)	980	(2,195)	502
Comprehensive income (loss)	$ (8,472)	$ (5,116)	$ 3,354