Stock Based Compensation (Details 1) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of option activity
Number of options, Outstanding, Beginning Balance	1,141
Weighted-Average Exercise Price, Outstanding, Beginning Balance	$ 10.12
Number of Options, Granted	285	216	33
Weighted-Average Exercise Price, Granted	$ 8.85
Number of Options, Exercised	(17)
Weighted-Average Exercise Price, Exercised	$ 1.30
Weighted-Average Exercise Price, Forfeited or expired	$ 11.42
Number of Options, Forfeited or expired	(25)
Number of options, Outstanding, Ending Balance	1,384	1,141
Weighted-Average Exercise Price, Outstanding, Ending Balance	$ 9.94	$ 10.12
Weighted-Average Remaining Contractual Term, Outstanding, Ending Balance	5 years 7 months 6 days
Aggregate Intrinsic Value, Outstanding, Ending Balance	$ 1,580
Number of Options, Options Exercisable	985
Weighted-Average Exercise Price, Options exercisable	$ 9.79
Weighted-Average Remaining Contractual Term, Options exercisable	4 years 2 months 12 days
Aggregate Intrinsic Value, Options exercisable	$ 1,468