Earnings per common share (Tables)

6 Months Ended

Jun. 30, 2016

Earnings Per Share [Abstract]

Computations of Basic Earnings Per Common Share

The computations of basic earnings per common share follow:

	Three months ended June 30						Six months ended June 30
	2016			2015			2016			2015
	(in thousands, except per share)
Income available to common shareholders:
Net income	$	336,031			286,688			634,559			528,301
Less: Preferred stock dividends (a)		(20,317	)		(20,317	)		(40,635	)		(40,635	)
Net income available to common equity		315,714			266,371			593,924			487,666
Less: Income attributable to unvested stock-based compensation awards		(2,746	)		(2,900	)		(5,227	)		(5,371	)
Net income available to common shareholders	$	312,968			263,471			588,697			482,295
Weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards		159,164			133,818			159,692			133,680
Less: Unvested stock-based compensation awards		(1,362	)		(1,462	)		(1,424	)		(1,477	)
Weighted-average shares outstanding		157,802			132,356			158,268			132,203
Basic earnings per common share	$	1.98			1.99			3.72			3.65

(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 June 30						Six months ended June 30
	2016			2015			2016			2015
	(in thousands, except per share)
Net income available to common equity	$	315,714			266,371			593,924			487,666
Less: Income attributable to unvested stock-based compensation awards		(2,740	)		(2,890	)		(5,217	)		(5,353	)
Net income available to common shareholders	$	312,974			263,481			588,707			482,313
Adjusted weighted-average shares outstanding:
Common and unvested stock-based compensation awards		159,164			133,818			159,692			133,680
Less: Unvested stock-based compensation awards		(1,362	)		(1,462	)		(1,424	)		(1,477	)
Plus: Incremental shares from assumed conversion of stock-based compensation awards and warrants to purchase common stock		539			760			493			741
Adjusted weighted-average shares outstanding		158,341			133,116			158,761			132,944
Diluted earnings per common share	$	1.98			1.98			3.71			3.63