Share-Based Compensation (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2014
$ 8.00 to $24.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Outstanding Options	380,080.00
Options Outstanding, Weighted Average Remaining Contractual Life	4 years 7 months
Options Outstanding, Weighted Average Exercise	$ 19.91
Options Exercisable, Number of Exercisable Options	380,080.00
Options Exercisable, Exercisable Options, Weighted Average Exercise Price	$ 19.91
$25.00 to $45.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Outstanding Options	952,110.00
Options Outstanding, Weighted Average Remaining Contractual Life	4 years 10 months
Options Outstanding, Weighted Average Exercise	$ 39.66
Options Exercisable, Number of Exercisable Options	849,939.00
Options Exercisable, Exercisable Options, Weighted Average Exercise Price	$ 40.50
$8.00 to $45.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Outstanding Options	1,332,190
Options Outstanding, Weighted Average Remaining Contractual Life	4 years 8 months
Options Outstanding, Weighted Average Exercise	$ 34.02
Options Exercisable, Number of Exercisable Options	1,230,019
Options Exercisable, Exercisable Options, Weighted Average Exercise Price	$ 34.14