Income Taxes (Tables)

9 Months Ended

Sep. 30, 2018

Income Tax Disclosure [Abstract]

Summary of Effective Income Tax Rate

The effective income tax rate differed from the expected rate for the three and nine month periods ended September 30, 2018 and 2017 as shown below:

	Three Months Ended September 30,
	2018			%		2017			%
Expected income taxes	$	46,270		21.0		$	77,214		35.0
Increase (reduction) in income taxes resulting from:
Low income housing investments	(2,779		)	(1.3	)	(4,367		)	(2.0	)
Share-based awards	(2,601		)	(1.2	)	(5,075		)	(2.3	)
Other	740			0.4		(508		)	(0.2	)
Income tax expense (benefit) from continuing operations	$	41,630		18.9		$	67,264		30.5

	Nine Months Ended September 30,
	2018			%		2017			%
Expected income taxes	$	138,608		21.0		$	214,997		35.0
Increase (reduction) in income taxes resulting from:
Low income housing investments	(9,428		)	(1.4	)	(13,665		)	(2.2	)
Share-based awards	(6,855		)	(1.0	)	(14,513		)	(2.4	)
Other	907			0.1		(3,429		)	(0.5	)
Income tax expense (benefit) from continuing operations	$	123,232		18.7		$	183,390		29.9