Stock Compensation (Details) (USD $)	6 Months Ended
	Jun. 30, 2012
Summary of the company's stock option activity
Outstanding at December 31, 2011, Underlying Shares	2,417,659
Outstanding at December 31, 2011, Weighted Average Exercise Price	$ 11.18
Granted, Underlying Shares	206,408
Granted, weighted average exercise Price	$ 6.95
Exercised, Underlying Shares	(111)
Exercised, Weighted Average Exercise Price	$ 5.52
Canceled or expired, Underlying Shares	(499,118)
Canceled or expired, Weighted Average Exercise Price	$ 10.16
Outstanding at June 30, 2012, Underlying Shares	2,124,838
Outstanding at June 30, 2012,Weighted Average Exercise Price	$ 11.01
Outstanding at June 30, 2012, Weighted Average Remaining Contractual Term	6 years 8 months 5 days
Outstanding at June 30, 2012, Aggregate Intrinsic Value	$ 13,578
Vested at June 30, 2012 and expected to vest, Underlying Shares	2,050,432
Vested at June 30, 2012 and expected to vest, Weighted Average Exercise Price	$ 11.12
Vested at June 30, 2012 and expected to vest, Weighted Average Remaining Contractual Term	6 years 5 months 19 days
Vested at June 30, 2012 and expected to vest, Aggregate Intrinsic Value	12,584
Exercisable at June 30, 2012, Underlying Shares	994,370
Exercisable at June 30, 2012, Weighted Average Exercise Price	$ 14.31
Exercisable at June 30, 2012, Weighted Average Remaining Contractual Term	3 years 9 months 22 days
Exercisable at June 30, 2012, Aggregate Intrinsic Value	$ 78