Share Based and Deferred Compensation (Option Activity) (Details) (USD $)	9 Months Ended
	Sep. 30, 2012 Y
Option activity
Outstanding at beginning of year, shares	3,599,672
Granted, shares	0
Exercised, shares	(165,159)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	(31,829)
Outstanding at end of year, shares	3,402,684
Vested/Exercisable, shares	2,735,766
Outstanding at beginning of year, Weighted Average Exercise Price	$ 14.50
Granted, Weighted Average Exercise Price	$ 0.00
Exercised, Weighted Average Exercise Price	$ 4.53
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$ 14.33
Outstanding at end of year, Weighted Average Exercise Price	$ 14.64
Vested/Exercisable at end of period, Weighted Average Exercise Price	$ 15.80
Outstanding at beginning of year, Weighted Average Remaining Contractual Term (in years)	7.20
Outstanding at end of year, Weighted Average Remaining Contractual Term (in years)	6.20
Vested/Exercisable at end of period, Weighted Average Remaining Contractual Term (in years)	6 years 1 month 2 days
Outstanding at beginning of year, Aggregate Intrinsic Value	$ (18,015,060)
Outstanding at end of year, Aggregate Intrinsic Value	(9,559,637)
Vested/Exercisable at end of year, Aggregate Intrinsic Value	$ (9,857,702)