Stock-Based Compensation (Company's Activities With Respect To Its Stock Options) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock-Based Compensation [Abstract]
Number of Shares Outstanding, Beginning Balance	2,831	3,608	3,786
Number of Shares, Granted	984	613	578
Number of Shares, Exercised	(776)	(1,381)	(704)
Number of Shares, Canceled	(60)	(9)	(52)
Number of Shares Outstanding, Ending Balance	2,979	2,831	3,608
Number of Shares Exercisable, Ending Balance	1,194
Number of Shares Unvested, Ending Balance	1,785
Weighted-Average Exercise Price Per Share Outstanding, Beginning Balance	$ 34.06	$ 28.06	$ 24.78
Weighted-Average Exercise Price Per Share, Granted	$ 73.17	$ 47.58	$ 41.91
Weighted-Average Exercise Price Per Share, Exercised	$ 27.57	$ 24.37	$ 21.53
Weighted-Average Exercise Price Per Share, Canceled	$ 52.54	$ 37.71	$ 32.07
Weighted-Average Exercise Price Per Share Outstanding, Ending Balance	$ 48.30	$ 34.06	$ 28.06
Weighted-Average Exercise Price Per Share Exercisable, Ending Balance	$ 31.17
Weighted-Average Exercise Price Per Share Unvested, Ending Balance	$ 59.74
Weighted-Average Remaining Contractual Life (in Years) Outstanding at December 31, 2013	4 years 3 months 18 days
Weighted-Average Remaining Contractual Life (in years) Exercisable at December 31, 2013	2 years 7 months 6 days
Weighted-Average Remaining Contractual Life (in years) Unvested at December 31, 2013	5 years 6 months
Aggregate Intrinsic Value Exercisable at December 31, 2013	$ 123,769
Aggregate Intrinsic Value Outstanding at December 31, 2013	70,033
Aggregate Intrinsic Value Unvested at December 31, 2013	$ 53,736