Fair Value (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Beginning balance - stock option liability	$ 347		$ 618		$ 502		$ 811
Unrealized loss (gain) included in net income (loss) (1)	(308)	[1]	(77)	[1]	(463)	[1]	(270)	[1]
Ending balance- stock option liability	$ 39		$ 541		$ 39		$ 541

[1] Included as a component of non-operating income (expense).