Stock Incentive Plans (Stock options outstanding ) (Details) (USD $)					3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2013 Stock options	Mar. 31, 2013 Stock options $2.00 - $2.20	Mar. 31, 2013 Stock options $11.60 - $24.50	Mar. 31, 2013 Stock options $29.82 - $90.80	Mar. 31, 2013 Stock options $127.60 - $167.60	Mar. 31, 2013 Stock options $207.60 - $588.80
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lower range of price						$ 2.00	$ 11.60	$ 29.82	$ 127.60	$ 207.60
Upper range of price						$ 2.20	$ 24.50	$ 90.80	$ 167.60	$ 588.80
Options Outstanding, Number Outstanding	284,829	284,829	535,592	576,773	284,829	154,288	11,175	84,694	28,166	6,506
Options Outstanding, Weighted Average Remaining Contractual Life (in years)					7 years 1 month 21 days	8 years 5 months 1 day	7 years 3 months 4 days	5 years 7 months 21 days	5 years 2 months 16 days	4 years 9 months 15 days
Options Outstanding, Weighted Average Remaining Exercise Price	$ 39.46	$ 39.46	$ 27.09	$ 26.16	$ 39.46	$ 2.02	$ 22.44	$ 61.40	$ 136.60	$ 250.55
Options Exercisable, Number Exercisable	203,112		188,937		203,112	75,571	8,175	84,694	28,166	6,506
Options Exercisable, Weighted Average Exercise Price	$ 54.19		$ 71.41		$ 54.19	$ 2.02	$ 21.69	$ 61.40	$ 136.60	$ 250.55
Options Outstanding, Weighted-Average Remaining Contractual Life, Exercisable (in years)					6 years 7 months 21 days