Earnings Per Share (Summary of Antidilutive Stock Options) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Earnings Per Share
Antidilutive stock options	190	[1]	1,465	[1]	639	[1]	1,483	[1]
Weighted-average exercise price	$ 106.40	[1]	$ 87.75	[1]	$ 98.77	[1]	$ 87.68	[1]

[1] See Note 8 for further discussion on the terms of the Company's share-based compensation plans.