Share-Based Compensation (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Number of Outstanding Options	7,513,088
Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	5 years 10 months 29 days
Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$ 10.34
Exercise Price Range, Number of Exercisable Options	4,286,232
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 10.12
Stock Options [Member] | Range One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 4.72
Exercise Price Range, Upper Range Limit	$ 7.00
Exercise Price Range, Number of Outstanding Options	235,987
Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	3 years 4 months 26 days
Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$ 6.68
Exercise Price Range, Number of Exercisable Options	234,387
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 6.68
Stock Options [Member] | Range Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 7.01
Exercise Price Range, Upper Range Limit	$ 7.46
Exercise Price Range, Number of Outstanding Options	418,780
Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	5 years 2 months 13 days
Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$ 7.23
Exercise Price Range, Number of Exercisable Options	337,905
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 7.23
Stock Options [Member] | Range Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 7.47
Exercise Price Range, Upper Range Limit	$ 7.48
Exercise Price Range, Number of Outstanding Options	521,356
Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	9 months 22 days
Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$ 7.47
Exercise Price Range, Number of Exercisable Options	521,356
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 7.47
Stock Options [Member] | Range Four [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 7.49
Exercise Price Range, Upper Range Limit	$ 8.00
Exercise Price Range, Number of Outstanding Options	332,423
Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	5 years 4 months 26 days
Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$ 7.80
Exercise Price Range, Number of Exercisable Options	259,354
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 7.80
Stock Options [Member] | Range Five [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 8.01
Exercise Price Range, Upper Range Limit	$ 9.00
Exercise Price Range, Number of Outstanding Options	263,731
Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	4 years 1 month 6 days
Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$ 8.56
Exercise Price Range, Number of Exercisable Options	238,399
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 8.56
Stock Options [Member] | Range Six [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 9.01
Exercise Price Range, Upper Range Limit	$ 10.00
Exercise Price Range, Number of Outstanding Options	1,718,033
Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	7 years 2 months 13 days
Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$ 9.60
Exercise Price Range, Number of Exercisable Options	690,241
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 9.63
Stock Options [Member] | Range Seven [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 10.01
Exercise Price Range, Upper Range Limit	$ 11.00
Exercise Price Range, Number of Outstanding Options	2,073,773
Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	7 years 3 months 20 days
Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$ 10.44
Exercise Price Range, Number of Exercisable Options	755,218
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 10.43
Stock Options [Member] | Range Eight [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 11.01
Exercise Price Range, Upper Range Limit	$ 13.00
Exercise Price Range, Number of Outstanding Options	715,540
Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	5 years 2 months 13 days
Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$ 12.17
Exercise Price Range, Number of Exercisable Options	482,133
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 12.07
Stock Options [Member] | Range Nine [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 13.01
Exercise Price Range, Upper Range Limit	$ 16.00
Exercise Price Range, Number of Outstanding Options	1,026,965
Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	6 years 1 month 7 days
Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$ 13.73
Exercise Price Range, Number of Exercisable Options	560,739
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 13.71
Stock Options [Member] | Range Ten [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 16.01
Exercise Price Range, Upper Range Limit	$ 49.50
Exercise Price Range, Number of Outstanding Options	206,500
Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	1 year
Exercise Price Range, Outstanding Options, Weighted Average Exercise Price	$ 16.32
Exercise Price Range, Number of Exercisable Options	206,500
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 16.32