Share-Based Compensation Plans (Details 1) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding Ending Balance, Shares	1,269
Outstanding weighted average exercise price, Ending Balance	$ 58.03
Summary of stock option activity
Exercisable, Shares	486
Exercisable, weighted average exercise price	$ 48.21
Outstanding, weighted average remaining contractual term (years)	6 years 3 months 18 days
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding Beginning Balance, Shares	1,717
Granted, Shares	407
Exercised, Shares	(828)
Forfeited or expired, Shares	27
Outstanding, weighted average exercise price, Beginning Balance	$ 49.99
Granted, weighted average exercise price	$ 71.49
Exercised, weighted average exercise price	$ 47.85
Forfeited or expired, weighted average exercise price	$ 61.41
Summary of stock option activity
Vested or expected to vest, Shares	1,193
Vested or expected, weighted average exercise price	$ 57.64
Vested or expected to vest, weighted average remaining contractual term (years)	5 years 9 months 18 days
Exercisable, weighted average remaining contractual term (years)	3 years 8 months 12 days
Outstanding, Aggregate Intrinsic Value, of In-The-Money Options	$ 44,195
Vested or expected to vest, Aggregate Intrinsic Value of In-The-Money Options	42,003
Exercisable, Aggregate Intrinsic Value of In-The-Money Options	$ 21,684