Stock-Based Compensation (Activity Of Options Outstanding That Had Not Yet Vested) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock-Based Compensation [Abstract]
Number of Shares, Unvested as of December 31, 2010	1,924
Weighted-Average Grant Date Fair Value Per Share, Unvested as of December 31, 2010	$ 11.35
Number of Shares, Granted	578	539	1,157
Weighted-Average Grant Date Fair Value Per Share, Granted	$ 18.53	$ 15.88	$ 8.79
Number of Shares, Vesting during period	(819)
Weighted-Average Grant Date Fair Value Per Share, Vesting during period	$ 11.03
Number of shares, Forfeited or cancelled	$ (43)
Weighted-Average Grant Date Fair Value Per Share, Forfeited or canceled	$ 12.95
Number of Shares, Unvested as of December 31, 2011	1,640	1,924
Weighted-Average Grant Date Fair Value Per Share, Unvested as of December 31, 2011	$ 14.00	$ 11.35