Share Based and Deferred Compensation (Option Activity) (Details) (USD $)	6 Months Ended
	Jun. 30, 2012 Y
Option activity
Outstanding at beginning of year, shares	3,599,672
Granted, shares	0
Exercised, shares	(94,429)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	(21,706)
Outstanding at end of year, shares	3,483,537
Vested/Exercisable, shares	2,811,754
Outstanding at beginning of year, Weighted Average Exercise Price	$ 14.50
Granted, Weighted Average Exercise Price	$ 0.00
Exercised, Weighted Average Exercise Price	$ 2.91
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$ 15.62
Outstanding at end of year, Weighted Average Exercise Price	$ 14.47
Vested/Exercisable at end of period, Weighted Average Exercise Price	$ 15.56
Outstanding at beginning of year, Weighted Average Remaining Contractual Term (in years)	7.20
Granted, Weighted Average Remaining Contractual Term (in years)	0.00
Outstanding at end of year, Weighted Average Remaining Contractual Term (in years)	6.46
Vested/Exercisable at end of period, Weighted Average Remaining Contractual Term (in years)	6.33
Outstanding at beginning of year, Aggregate Intrinsic Value	$ (18,015,060)
Outstanding at end of year, Aggregate Intrinsic Value	(8,656,997)
Vested/Exercisable at end of year, Aggregate Intrinsic Value	$ (9,052,503)