Stock-Based Compensation (Activity Of Options Outstanding Not Yet Vested) (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock-Based Compensation [Abstract]
Number of Shares, Unvested as of December 31, 2013	1,785
Number of Shares, Granted	1,121	984	613
Number of Shares, Vesting during period	(641)
Number of Shares, Forfeited or canceled	(44)
Number of Shares, Unvested as of December 31, 2014	2,221	1,785
Weighted-Average Fair Value Per Share, Unvested as of December 31, 2013	$ 18.15
Weighted-Average Fair Value Per Share, Granted	$ 19.49	$ 17.38	$ 20.31
Weighted-Average Fair Value Per Share, Vesting during period	$ 17.98
Weighted-Average Fair Value Per Share, Forfeited or canceled	$ 17.52
Weighted-Average Fair Value Per Share, Unvested as of December 31, 2014	$ 18.89	$ 18.15