Income Taxes (Tables)

3 Months Ended

Mar. 31, 2012

Income Taxes [Abstract]

Income Tax Expense

	Three Months Ended March 31,
	2012			2011
Current income tax expense	$	20,052		$	12,792
Deferred income tax benefit		(2,539	)		(139	)
Income tax expense as reported	$	17,513		$	12,653
Effective tax rate		22.3	%		19.6	%