Share Based and Deferred Compensation (Option Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Option activity
Outstanding at beginning of year, shares	3,599,672	3,116,611	2,404,567
Granted, shares	0	603,241	724,805
Exercised, shares	(230,294)	(120,180)	(12,761)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period	(31,829)
Outstanding at end of year, shares	3,337,549	3,599,672	3,116,611
Vested/Exercisable, shares	2,692,086	2,287,729	1,384,728
Outstanding at beginning of year, Weighted Average Exercise Price	$ 14.50	$ 14.56	$ 15.48
Granted, Weighted Average Exercise Price	$ 0.00	$ 11.89	$ 11.31
Exercised, Weighted Average Exercise Price	$ 4.25	$ 2.91	$ 2.91
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	$ 14.85	$ 14.50	$ 14.56
Vested/Exercisable at end of period, Weighted Average Exercise Price	$ 16.06	$ 17.01	$ 17.63
Outstanding at beginning of year, Weighted Average Remaining Contractual Term (in years)	7 years 2 months 13 days	7 years 9 months 23 days	8 years 4 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term		9 years 2 months 6 days	9 years 2 months 6 days
Outstanding at end of year, Weighted Average Remaining Contractual Term (in years)	5 years 11 months 13 days	7 years 2 months 13 days	7 years 9 months 23 days
Vested/Exercisable at end of period, Weighted Average Remaining Contractual Term (in years)	5 years 9 months 10 days	6 years 7 months 3 days	7 years 1 month 21 days
Outstanding at beginning of year, Aggregate Intrinsic Value	$ 0
Outstanding at end of year, Aggregate Intrinsic Value	0	0
Vested/Exercisable at end of year, Aggregate Intrinsic Value	$ 0