Income Taxes (Tables)

9 Months Ended

Sep. 30, 2012

Income Tax Expense

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Current income tax expense	$	18,114		$	24,036		$	55,631		$	50,101
Deferred income tax expense (benefit)		(1,043	)		(382	)		(5,020	)		(137	)
Income tax expense, as reported	$	17,071		$	23,654		$	50,611		$	49,964
Effective tax rate		22.5	%		30.3	%		22.2	%		23.6	%