Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings Per Common Share

The following table sets forth the computation of basic and diluted earnings per common share for 2017 , 2016 and 2015:

(In thousands, except per share data)		2017		2016		2015
Net income		$	257,682	$	206,875	$	156,749
Less: Preferred stock dividends		9,778		14,513		10,869
Net income applicable to common shares—Basic	(A)	$	247,904	$	192,362	$	145,880
Add: Dividends on convertible preferred stock, if dilutive		1,578		6,313		6,314
Net income applicable to common shares—Diluted	(B)	$	249,482	$	198,675	$	152,194
Weighted average common shares outstanding	(C)	54,703		50,278		47,838
Effect of dilutive potential common shares:
Common stock equivalents		998		894		1,029
Convertible preferred stock, if dilutive		985		3,100		3,070
Total dilutive potential common shares		1,983		3,994		4,099
Weighted average common shares and effect of dilutive potential common shares	(D)	56,686		54,272		51,937
Net income per common share:
Basic	(A/C)	$	4.53	$	3.83	$	3.05
Diluted	(B/D)	4.40		3.66		2.93