Stock Based Compensation (Details 1) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Summary of nonvested stock activity
Granted, Shares	1,020,979	3,060,519
Nonvested Stock Options [Member]
Summary of nonvested stock activity
Stock Options Shares Outstanding, Beginning balance	4,036,595	2,431,339
Granted, Shares	1,020,979	3,060,519
Vested, Shares	(1,590,628)	(1,097,571)
Forfeited, Shares	(84,607)	(357,692)
Stock Options Shares Outstanding, Ending balance	3,382,339	4,036,595
Nonvested Weighted Average Grant Date Fair Value, Beginning balance	5.11	5.11
Granted Weighted Average Grant Date Fair Value	3.80	5.03
Vested Weighted Average Grant Date Fair Value	5.13	4.88
Forfeited Weighted Average Grant Date Fair Value	5.17	5.12
Nonvested Weighted Average Grant Date Fair Value, Ending balance	4.70	5.11