Share-Based Compensation (Information Concerning Currently Outstanding and Exercisable Options) (Details)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Number of options outstanding, in shares | shares	1,592,167
Weighted average remaining life, Outstanding, in years	5 years 2 months
Weighted average exercise price, options outstanding, in dollars per share | $ / shares	$ 33.91
Number of options exercisable, in shares | shares	1,053,687
Weighted average remaining life, Exercisable, in years	3 years 7 months
Weighted average exercise price, option exercisable, in dollars per share | $ / shares	$ 25.64
10.01 - 20.00 [Member]
Number of options outstanding, in shares | shares	239,563
Weighted average remaining life, Outstanding, in years	3 years 2 months
Weighted average exercise price, options outstanding, in dollars per share | $ / shares	$ 15.26
Number of options exercisable, in shares | shares	239,563
Weighted average remaining life, Exercisable, in years	3 years 2 months
Weighted average exercise price, option exercisable, in dollars per share | $ / shares	$ 15.26
20.01 - 30.00 [Member]
Number of options outstanding, in shares | shares	628,033
Weighted average remaining life, Outstanding, in years	3 years
Weighted average exercise price, options outstanding, in dollars per share | $ / shares	$ 25.47
Number of options exercisable, in shares | shares	628,033
Weighted average remaining life, Exercisable, in years	3 years
Weighted average exercise price, option exercisable, in dollars per share | $ / shares	$ 25.47
30.01 - 40.00 [Member]
Number of options outstanding, in shares | shares	180,154
Weighted average remaining life, Outstanding, in years	6 years
Weighted average exercise price, options outstanding, in dollars per share | $ / shares	$ 32.30
Number of options exercisable, in shares | shares	121,392
Weighted average remaining life, Exercisable, in years	5 years 6 months
Weighted average exercise price, option exercisable, in dollars per share | $ / shares	$ 32.28
40.01 - 50.00 [Member]
Number of options outstanding, in shares | shares	161,601
Weighted average remaining life, Outstanding, in years	8 years
Weighted average exercise price, options outstanding, in dollars per share | $ / shares	$ 43.37
Number of options exercisable, in shares | shares	5,098
Weighted average remaining life, Exercisable, in years	8 years
Weighted average exercise price, option exercisable, in dollars per share | $ / shares	$ 43.58
50.01 - 60.00 [Member]
Number of options outstanding, in shares | shares	382,816
Weighted average remaining life, Outstanding, in years	8 years 6 months
Weighted average exercise price, options outstanding, in dollars per share | $ / shares	$ 56.18
Number of options exercisable, in shares | shares	59,601
Weighted average remaining life, Exercisable, in years	7 years 1 month
Weighted average exercise price, option exercisable, in dollars per share | $ / shares	$ 54.08