Stock Incentive Plans (Details) (USD $)	9 Months Ended
	Sep. 30, 2012
Shares available for grant
Shares available for grant, Beginning balance	2,259,999
Shares available for grant, Granted	(94,595)
Shares available for grant, Exercised
Shares available for grant, Cancelled/forfeited	24,600
Shares available for grant, Ending balance	2,190,004
Number of options outstanding
Number of options outstanding, Beginning balance	2,093,108
Number of options outstanding, Granted	77,250
Number of options outstanding, Exercised	(2,885)
Number of options outstanding, Cancelled/forfeited	(24,754)
Number of options outstanding, Ending balance	2,142,719
Weighted average option exercise price
Weighted average option exercise price, Beginning balance	$ 13.45
Weighted average option exercise price, Granted	$ 9.74
Weighted average option exercise price, Exercised	$ 4.00
Weighted average option exercise price, Cancelled/forfeited	$ 16.44
Weighted average option exercise price, Ending balance	$ 13.27
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	13,735
Number of restricted stock and board shares issued, Cancelled/forfeited
Number of restricted stock and board shares issued, Ending balance	59,932