Stock Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2011

Stock Compensation Plans [Abstract]

Schedule Of Stock Option Activity

	Options			Weighted- Average Exercise Price		Weighted-Average Remaining Contractual Term		Aggregate Intrinsic Value as of December 31, 2011
Outstanding at January 1, 2011		1,098,859		$	21.37
Granted		272,412			35.89
Forfeited		(34,129	)		27.93
Exercised		(471,697	)		19.41
Outstanding at December 31, 2011		865,445		$	26.72		4.7	$	16,684
Options exercisable at December 31, 2011		419,474		$	23.66		3.7	$	9,372

Schedule Of Restricted Stock Activity

	Shares			Weighted-Average Grant Date Fair Value
Non-vested at beginning of period		40,313		$	23.53
Granted		32,045			42.04
Forfeited		(624	)		18.96
Vested		(28,207	)		26.10
Non-vested at December 31, 2011		43,527		$	32.31

Schedule Of Grant At Fair Value

	For the Years Ended December 31
	2011			2010			2009
Risk-free interest rate		0.66% and 1.83	%		1.85% and 2.14	%		1.38% and 1.44	%
Expected dividend yield		0	%		0	%		0	%
Expected option life		4 years			4 years			4 years
Expected volatility		47.9% - 48.7	%		43.5% and 46.5	%		48.3	%
Weighted-average expected volatility		48.7	%		46.5	%		48.3	%