Income Taxes (Tables)

9 Months Ended

Sep. 30, 2012

Summary of Effective Income Tax Rate

The effective income tax rate differed from the expected 35% rate as shown below:

	Three months ended September 30,												Nine months ended September 30,
	2012						2011						2012						2011
	Amount			%			Amount			%			Amount			%			Amount			%
Expected income taxes	$	66,077			35.0		$	66,543			35.0		$	190,892			35.0		$	191,343			35.0
Increase (reduction) in income taxes resulting from:
Tax-exempt investment income		(796	)		(0.4	)		(906	)		(0.5	)		(2,701	)		(0.5	)		(2,599	)		(0.5	)
Low-income housing investments		(7,150	)		(3.8	)		(7,066	)		(3.7	)		(21,728	)		(4.0	)		(17,184	)		(3.2	)
Other		(12	)		0.0			296			0.2			606			0.1			355			0.1
Income tax expense	$	58,119			30.8		$	58,867			31.0		$	167,069			30.6		$	171,915			31.4