Stock Incentive Plans (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Shares available for grant
Shares available for grant, Beginning balance		2,259,999
Shares available for grant, Granted		(62,595)
Shares available for grant, Exercised
Shares available for grant, Cancelled/forfeited		15,875
Shares available for grant, Ending balance	2,213,279	2,213,279
Number of options outstanding
Number of options outstanding, Beginning balance		2,093,108
Number of options outstanding, Granted		45,250
Number of options outstanding, Exercised		(1,385)
Number of options outstanding, Cancelled/forfeited		(16,029)
Number of options outstanding, Ending balance	2,120,944	2,120,944
Weighted average option exercise price
Weighted average option exercise price, Beginning balance		$ 13.45
Weighted average option exercise price, Granted		$ 9.85
Weighted average option exercise price, Exercised		$ 3.99
Weighted average option exercise price, Cancelled/forfeited		$ 15.38
Weighted average option exercise price, Ending balance	$ 13.35	$ 13.35
Number of restricted stock and board shares issued
Number of restricted stock and board shares issued, Beginning balance		42,587
Number of restricted stock and board shares issued, Granted		17,345
Number of restricted stock and board shares issued, Exercised	0
Number of restricted stock and board shares issued, Cancelled/forfeited
Number of restricted stock and board shares issued, Ending balance	59,932	59,932