Equity-Based Compensation Plans (Details 1) (USD $)	9 Months Ended
	Sep. 30, 2014
Summary of stock option activity
Number of options, Beginning balance	4,005,589
Weighted Average Exercise Price, Beginning balance	$ 15.40
Number of Options, Granted	737,500
Weighted Average Exercise Price, Granted	$ 10.90
Number of Options, Exercised	(27,268)
Weighted Average Exercise Price, Exercised	$ 7.16
Number of Options, Cancelled	(722,674)
Weighted Average Exercise Price, Cancelled	$ 19.65
Number of options, Ending balance	3,993,147
Weighted Average Exercise Price, Ending balance	$ 13.86
Weighted Average Remaining Contractual Life-Years	4 years 4 months 22 days
Aggregate intrinsic value, Ending balance	$ 20,692,356
Number of Options, Exercisable options	2,404,269
Weighted Average Exercise Price, Exercisable options	$ 16.71
Weighted Average Remaining Contractual Term, Exercisable options	3 years 7 months 12 days
Aggregate Intrinsic Value, Exercisable options	9,208,192
Number of Options, Expected to vest	1,534,806
Weighted Average Exercise Price, Expected to vest options	$ 9.51
Weighted Average Remaining Contractual Term, Expected to vest options	5 years 6 months 12 days
Aggregate Intrinsic Value, Expected to vest	$ 11,163,322