Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

Significant Accounting Policies [Abstract]

Summary Of Assumptions For Options Granted

	2011			2010			2009
Volatility factor		42.3	%		40.3	%		29.6	%
Dividend yield		1.0	%		1.3	%		2.4	%
Expected term (in years)		4.66			4.74			4.72
Risk-free rate		2.0	%		2.5	%		2.6	%