Earnings per common share (Tables)

3 Months Ended

Mar. 31, 2014

Earnings Per Share [Abstract]

Computations of Basic Earnings Per Common Share

The computations of basic earnings per common share follow:

	Three months ended March 31
	2014			2013
	(in thousands, except per share)
Income available to common shareholders:
Net income	$	229,017			274,113
Less: Preferred stock dividends (a)		(14,674	)		(13,363	)
Amortization of preferred stock discount (a)		—			(2,147	)
Net income available to common equity		214,343			258,603
Less: Income attributable to unvested stock-based compensation awards		(2,623	)		(3,524	)
Net income available to common shareholders	$	211,720			255,079
Weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards		131,800			129,449
Less: Unvested stock-based compensation awards		(1,588	)		(1,780	)
Weighted-average shares outstanding		130,212			127,669
Basic earnings per common share	$	1.63			2.00

(a) Including impact of not as yet declared cumulative dividends.

Computations of Diluted Earnings Per Common Share

The computations of diluted earnings per common share follow:

	Three months ended March 31
	2014			2013
	(in thousands, except per share)
Net income available to common equity	$	214,343			258,603
Less: Income attributable to unvested stock-based compensation awards		(2,612	)		(3,507	)
Net income available to common shareholders	$	211,731			255,096
Adjusted weighted-average shares outstanding:
Common and unvested stock-based compensation awards		131,800			129,449
Less: Unvested stock-based compensation awards		(1,588	)		(1,780	)
Plus: Incremental shares from assumed conversion of stock-based compensation awards		914			967
Adjusted weighted-average shares outstanding		131,126			128,636
Diluted earnings per common share	$	1.61			1.98