Share Based Compensation, 401(k) Plan and Deferred Compensation (Option Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 Years	Dec. 31, 2010 Years	Dec. 31, 2009 Years
Option activity
Outstanding at beginning of year, shares	3,116,611	2,404,567	1,754,648
Granted, shares	603,241	724,805	676,491
Exercised, shares	(120,180)
Forfetied/Expired, shares		(12,761)	(26,572)
Outstanding at end of year, shares	3,599,672	3,116,611	2,404,567
Vested/Exercisable, shares	2,287,729	1,384,728	616,119
Outstanding at beginning of year, Weighted Average Exercise Price	$ 14.56	$ 15.48	$ 20.41
Granted, Weighted Average Exercise Price	$ 11.89	$ 11.31	$ 2.91
Forfeited/Expired, Weighted Average Exercise Price		$ 2.91	$ 20.61
Exercised, Weighted Average Exercise Price	$ 2.91
Outstanding at end of year, Weighted Average Exercise Price	$ 14.50	$ 14.56	$ 15.48
Vested/Exercisable at end of period, Weighted Average Exercise Price	$ 17.01	$ 17.63	$ 20.03
Outstanding at beginning of year, Weighted Average Remaining Contractual Term	7.81	8.38	8.77
Granted, Weighted Average Remaining Contractual Term (in years)	9.18	9.18	9.25
Outstanding at end of year, Weighted Average Remaining Contractual Term	7.20	7.81	8.38
Vested/Exercisable at end of period, Weighted Average Remaining Contractual Term	6.59	7.14	7.54
Outstanding at beginning of year, Aggregate Intrinsic Value	$ (9,080,625)
Granted, Aggregate Intrinsic Value	$ (1,441,746)
Outstanding at end of year, Aggregate Intrinsic Value	(18,015,060)	(9,080,625)
Vested/Exercisable at end of year, Aggregate Intrinsic Value	$ 16,912,225