Share-Based Compensation (Information Concerning Currently Outstanding and Exercisable Options) (Details)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
10.01 - 20.00 [Member]
Number of options outstanding, in shares | shares	345,085
Weighted average remaining life, Outstanding, in years	2 years 3 months 30 days
Weighted average exercise price, options outstanding, in dollars per share | $ / shares	$ 13.97
Number of options exercisable, in shares | shares	345,085
Weighted average remaining life, Exercisable, in years	2 years 3 months 30 days
Weighted average exercise price, option exercisable, in dollars per share | $ / shares	$ 13.97
20.01 - 30.00 [Member]
Number of options outstanding, in shares | shares	962,251
Weighted average remaining life, Outstanding, in years	3 years 6 months 30 days
Weighted average exercise price, options outstanding, in dollars per share | $ / shares	$ 25.86
Number of options exercisable, in shares | shares	962,251
Weighted average remaining life, Exercisable, in years	3 years 6 months 30 days
Weighted average exercise price, option exercisable, in dollars per share | $ / shares	$ 25.86
30.01 - 40.00 [Member]
Number of options outstanding, in shares | shares	2,078,727
Weighted average remaining life, Outstanding, in years	4 years 1 month 1 day
Weighted average exercise price, options outstanding, in dollars per share | $ / shares	$ 34.24
Number of options exercisable, in shares | shares	2,078,727
Weighted average remaining life, Exercisable, in years	4 years 1 month 1 day
Weighted average exercise price, option exercisable, in dollars per share | $ / shares	$ 34.24
40.01 - 50.00 [Member]
Number of options outstanding, in shares | shares	1,054,346
Weighted average remaining life, Outstanding, in years	6 years 5 months 30 days
Weighted average exercise price, options outstanding, in dollars per share | $ / shares	$ 41.92
Number of options exercisable, in shares | shares	648,129
Weighted average remaining life, Exercisable, in years	6 years 3 months 30 days
Weighted average exercise price, option exercisable, in dollars per share | $ / shares	$ 41.88
50.01 - 60.00 [Member]
Number of options outstanding, in shares | shares	1,147,510
Weighted average remaining life, Outstanding, in years	8 years 2 months 30 days
Weighted average exercise price, options outstanding, in dollars per share | $ / shares	$ 59.55
Number of options exercisable, in shares | shares	325,890
Weighted average remaining life, Exercisable, in years	7 years 10 months 30 days
Weighted average exercise price, option exercisable, in dollars per share | $ / shares	$ 59.82
Sixty point zero one dollars to seventy dollars [Member]
Number of options outstanding, in shares | shares	1,248,110
Weighted average remaining life, Outstanding, in years	9 years
Weighted average exercise price, options outstanding, in dollars per share | $ / shares	$ 67.06
Number of options exercisable, in shares | shares	1,570
Weighted average remaining life, Exercisable, in years	2 years 7 months 30 days
Weighted average exercise price, option exercisable, in dollars per share | $ / shares	$ 67.06
Ten point seventy four dollars to sixty eight point seventy dollars [Member]
Number of options outstanding, in shares | shares	6,836,029
Weighted average remaining life, Outstanding, in years	5 years 10 months 30 days
Weighted average exercise price, options outstanding, in dollars per share | $ / shares	$ 43.46
Number of options exercisable, in shares | shares	4,361,652
Weighted average remaining life, Exercisable, in years	4 years 5 months 30 days
Weighted average exercise price, option exercisable, in dollars per share | $ / shares	$ 33.85