Stock-Based Compensation (Summary Of RSUs Under The 2007 Plan) (Details) (2007 Incentive Plan [Member], Restricted Stock Units (RSUs) [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
2007 Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]
Number of Shares [Roll Forward]
Restricted Stock Units outstanding, beginning balance	733	605	495
Granted, Shares	189	301	260
Released, Shares	(189)	(152)	(140)
Forfeited, Shares	(8)	(21)	(10)
Restricted Stock Units outstanding, ending balance	725	733	605
Weighted Average Price [Roll Forward]
Beginning balance, Weighted average price	$ 78.62
Granted, Weighted average price	$ 144.75
Released, Weighted average price	$ 143.89
Forfeited, weighted average price	$ 51.32
Ending balance, Weighted average price	$ 77.84	$ 78.62
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Expected to vest, shares	691	683	551
Ending balance, Weighted average remaining contractual term (years)	1 year 9 months 18 days
Expected to Vest, Weighted average remaining contractual term (years)	1 year 8 months 12 days
Ending balance, Aggregate intrinsic value	$ 112,574
Expected to Vest, Aggregate intrinsic value	$ 107,322